When Party and Eurobet split some time ago I stayed with Eurobet to keep the rakeback deal, and the games got A LOT harder. I mainly play 3/6 and 5/10 6max.

I tried to go back to Party a few days ago and I found the games much softer. I still havent figured out if the softness at Party compensates for the loss of rakeback at Eurobet, but I think that it might. I would like to hear someones opinion on this? (If you play on Eurobet without rakeback : stop immediately :-) ).

With regards to your samplesize, I have had downswings and good runs lasting more than 10000 hands - your winrate over 2000 hands is absolutely insignificant.
I would suggest playing at least 20000 hands at 1/2, and if you have a good winrate after that move up.