Definitely increase your VPIP/PFR from CO and Button to around 30 to begin with imo. I would have sworn SOME people steal at these stakes? If so, start figuring out who and 3bet them more from the SB, and especially on the Button if they steal from the CO. You are playing very nitty so far but those are a few things I suggest for now and you can open your game up even more once you start getting used to it. I'm also more aggro. I'd like to see your river aggro stats as I doubt any 25nlers value bet thin enough on the river.