Sorry for not responding quite long...
The escape rate formula is on bulbapedia iirc.
Also the guide was not originally written for DP as I have little or no experience there, it was written for RSE/FRLG.
The Berry Powder formula I can't even remember where I got that... It happened a time ago when I just had FireRed myself. But I used the formula on ingame numbers and it worked very accurate.
For the Pay Day money, the formula's I find all boil down on the same result, which is in the guide...
See the following links for verification of some of your doubts:
Thank you for posting some mistakes indeed, the critical hit thing was very obvious and the stat formula looks better I agree.
Feel free to change stuff and it would also be a very good idea to convert it to LateX to make the formulas look better... I'm not very familiar with using LateX but the documents always look very good.