small sample size,or,big difference in play?

I usually play 109,sometimes I drop to 55 if im having a bad day.
Like I said in my previous post I didnt do to good in blackjack.So while waiting for neteller,I"m going over the numbers.
I played 724 109 s stt average 18.67 per tournament
through 84 55s average 29.93 per tournament.
Is it really that big of a difference in play.or is the sample size to small.
Looking at this numbers maybe i should just play 55s

[TheNoodleMan]

are thouse numbers ROI, $ per tourney?
either way it is to soon to make any judgements. Sample size is too small.

[tigerite]

Agreed, my last 78 $33s have been 39% ROI. Totally unsustainable. So is 29% at the $55s I would say. 84 really is nothing, I'm afraid.