It may be that on Friday and Saturdays you find the widest variety of player types, take this into account when playing, and accept that there may be more 'unconventional' play, I'm sure over time this will work to your advantage, you really do want AQ v A3 match ups as often as possible (it definitely +ev in the long run).
Think there's definately more players putting you all in on Saturday - course you could be folding those, but when you're sure you're ahead, you have to call. Big variance then I guess.
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Trying to work out if I play different on a Saturday or the players who I meet do!
have no idea why, could be to do with my weekly routine / peak mental agility, could be player pools are weaker on other days or just variance.