Actually, the voltage of each cell remains the same so it doesn’t effect the battery cells at all. The only way to reduce the current in the cells is to use more total cells regardless of their parallel/series arrangement.
It also depends on how you look at it… if I have 6 packs of 6 cells and I change to 6 packs of 7 cells then I have added 6 more cells but I’ve also added the weight of those cells and I fly longer because my batteries are bigger. But I also reduce amps per cell because I have more cells (not because I changed my pack voltage).