It’s pretty easy to calculate: thrust required for level flight is your all up weight multiplied by the inverse of your L/D (glide) ratio.
285 lbs x (1/5.3) = 53.7 lbs thrust required for level flight, at trim speed. Keep in mind that your thrust at trim speed will be less than your static thrust. That 5.3:1 L/D ratio seems to work out for performance calculations based on numbers that have been published on this forum. Doubling that thrust number (108 lbs of thrust) should give you a climb rate that is roughly the same as your power off sink rate (~200-300 FPM).