I dont see how me switching from the 25 to 50 is not considered moving up.

I base what level of stakes I play at on how many buyins my bankroll can afford (15-20) not on the blinds.
Twice as much money is at stake at each table. I just take small pots when I can, but otherwise Im just waiting for good opportunities to get it all in against someone else.
I can see it being different at 6max..but for me the full ring games are just move-in games.

Johnny, a couple questions...

Are the $100 games very much harder?
How much BR would be sufficient for those stakes?