PlanetADnD.com

I found the note about rounding in CompPsiHB under the 'power checks' entry at the start of the book. I think it may be in the reprint but not the old one or vice versa, but this version has it.
https://adnd2e.fandom.com/wiki/A_Psioni ... er_(CPsiH)

Ah, yes, there it is. It's on page 11 of CPsiHB. I was looking at Understanding Power Descriptions on p28.

Thanks!