So... I took a quick look at the code from the last update, I noticed something nice. Well, to summarize, the increase in the attribute limit isn't really +5k, it's actually (total_qi*15)+5k, this total_qi represents how much Qi the MC has managed to absorb up to that point. To illustrate, in general players will have absorbed 70 Qi meaning that their stat limits will receive +6050 (if Paragon/Overlord active +6575; if Beauty +7100 in CHR).
As for someone who has done their utmost to get Qi (125 as far as I know), they get +6875 (if Paragon/Overlord active +7813; if Beauty +8750 in CHR).