Realistically going by one table is not going to get you anywhere near a reasonable sample size fast enough for it to worthwhile. Assuming you want about 30k hands to back up a decent winrate to prove you are 'beating' a level, you ll need 500 table hours assuming 60 hands per hour. IMO adding at least to 4 tables is inevitable in the near future no matter what stake you decide to settle at..
So go ahead and add another table now, stick with it for several days. Get comfy then take 3 and so on. Now dont fall into the trap of playing too many tables, you need to actually play and not go autopilot and therefore stop learning...like I think I have these past 2 months playing 9 tables at 5nl. I'm on a 1bb/100 all in EV win rate over 90k hands which is kind of lolbad...planning to cut back to 6 tables next month, at least for a week anyway.
