I know it is confusing to many people who do not understand how that can be. I will use ITV again as an example because I am familiar with their glider line, but it applies to other brands as well. If you look at their chart and the Jedi2 for instance, a mid-range EN-B and DGAC certified. There is absolutely no profile difference between the EN and DGAC versions but yet, it is a great glider in thermals and the same with PPG. Choose for example the size M between and notice a 30kg max recommended PPG weight over the PG max recommended weight. The thing is that there is another buffer zone the glider can take before it enters the red zone and structural failure. To say that in PG mode, there is not much to fear when that is concerned. This is the reason why I have seen 200lbs pilots flying big gas engines under an ITV 18m3 (Bip Bip18) or even 26 m2. That is good news and proof of the structural integrity under load our toys can have nowadays. I fly the Jedi2 as my personal glider. I used to fly comp wings years back, then went down to EN-C and now am perfectly happy with EN-B and often fly EN-A:)
The only difference between the Jedi2 certified EN and the Jedi2 certified DGAC is the addition of a riser set with built-in trimmers. When going through the DGAC with the trimmers it will have to pass certain requirements specific to PPG to become certified.
If you take a look at this video, you will notice that I am flying my Jedi2 with the removal ITV “Power-Kit” still connected to my risers https://www.youtube.com/watch?v=nBrXkIYbtLU
. I was just lazy and did not feel like removing it (takes 5 mn to do ). Now, look at the same wing under power with a different pilot and note that he removed the “Power-Kit” - I paraglide with the Power-Kit and he Paramotors without it, hahaha… https://www.youtube.com/watch?v=ZPodcqd1gx4
The glider flies just the same on one aspect but will not when in PG mode because of the riser connections to the PG harness or PPG frame. A good pilot will quickly adapt to the difference between the two modes https://www.youtube.com/watch?v=ZPodcqd1gx4
Now, to go back to your wing, I would recommend getting a size up for the simple reason that you increased the “All up weight” with your OpenPPG thus making your glider more reactive. There always are compromises to make if you want to have your cake and eat it too.
Same all up weight:
More collapse resistant
Will require more active flying .
Will loose more altitude during a collapse.
Faster but more violent reopenings.
#Will require very quick precise glider control if something goes wonky on you.
Will require faster airspeed to takeoff especially at higher elevations over sea level (density altitude) - longer runways and shorter at sea level.
Will come in faster for landings especially at higher altitudes and will demand special attention to burn the glider’s energy (acceleration hands/toggle at trim speed before smoothly flaring).
Easier to launch at sea level or at higher elevations
Easier to soar with in thermals, dynamic or thermal/dynamic conditions.
Easier to land with a larger surface area.
Will loose less altitude during a collapse.
Will have a smoother reopening.
Will be more forgiving in general.
Will get away with shorter runways.
Will be more prone to collapses in turbulent air (lighter wing loading)
Will be harder to get down if caught in a thermal without inducing a descent maneuver (Ears, Ears and Speed-bar together, spiral, B-stall).
One of my students, started his P2 (Beginner) training in Utah at 4000’ ASL. He was impatient and wanted to get his gear asap, so they sold him a size L (large) for his all up weight. Great! The problem was that he lives here at sea level, and one day when I was not around to keep an eye on him, he went to our local cliff site and tookeoff. To make the story short, he could not come down when the wind speed pocked-up. He had no speed-bar connected which would not have made a difference because he did not yet know how to use one. He was stuck up there and struggling over the water. He finally made it but almost crashed into a bulkhead on the beach at the base of the cliffs. I became aware of it the next day and saw the photos some of my certified students had taken and knew better than taking off when there were white caps on the water. I later told the guy about ignorance and bad decision making could hve resulted in a lousy ending. Told him to get rid of his glider and buy one size down which he did and now he is happy as a clam - he took this short video of one of his flights https://www.youtube.com/watch?v=MzuflDWjGHs
I hope it helped.