I see no way to balance touchscreen play with Mouse/Tablet play. The only reason this isn't a massive problem is because there are very few touchscreen players.
Touchscreen play is not comparable in any way, and no touchscreen aim is anywhere near remotely impressive when compared to Mouse/Tablet aim.
And please stop flattering yourself about your PP scores compared to your rank, it's kinda unbearable (edit: you did, <3)
Touchscreen is a fundamentally unbalanced playstyle that rewards massively disproportionate PP compared to the effort and skill required to achieve the scores compared to just about any Mouse/Tablet play.
Yes, there is skill required in playing touchscreen - I tried it once, didn't particularly care for it, went back to tablet - but when it comes to aim maps, it's not even close.