I have a copy of this sheet where I'm calculating EXP Total, but I only know the XP values for PL1 and PL100 without doing the math. I might add another column showing the pre-change equivalent and share it here.
Those numbers don't line up... but as others have already pointed out, they're kinda moot point until we know what the XP-per-kill ratio is at 60 vs. 70.
It's not exponential, it's quadratic (and the original paragon curve wasn't exponential either, it was piecewise quadratic). Different beast entirely.
If that chart is correct, then P100 -> P163, and P100*10 -> P531, so I'm not sure what's up with the P100*10 players getting 376... that maps back to just a shade over 5 P100s... somethings off. Perhaps you need to log into a character once before its XP gets added to your total?