i play 25 nl on PS 16 tables a time and i managed a 2.1ptbb/100 hands over 500k hands.

last month or so, because i was feeling very tired i dropped to 6-8 tables because i couldnt concentrate on 16 anymore.

i have seen that even my stats are the same, my winrate went up to 4.7ptbb/100 hands over 70k hands playing 6-8 tables

my question is, which is my real level for 25nl, the 4.7ptbb/100 on 6-8 tables or the 2.1ptbb/100 on 16 tables and why is this difference given that my stats are the same in both cases and the sample size is big enough for the 6-8 tables sessions.