Hi zumpar,
I am just rebuilding my iPoker database as I recently played about 70k hands there myself at the micro's.
At first glance though, I can say you get away with 3-betting light IP a lot more I am pretty sure my 3Bet was running at around 12% which is obviously pretty wide compared to yours, my bb/100 for uncalled 3Bet pots I will post when I get the database back but I am pretty sure that i made a healthy winrate from them. Also, IP you can definitely CBet more, there are a lot of fit or fold type regs that are easily exploitable, when you notice they are calling you a bit more often, I found that checking behind led to them b/f the turn frequently, I found the regs to be VERY passive at iPoker overall tbh.
My first 30k hands for stats comparison.
I'll post the rest later as I said from poker tracker, this was just a first glance option so thought I'd show you it.
My 3Bet is quite low here, but obviously I played for another 40k hands after working out who the regs/fish were and then working on building my game to suit. Plus, I hadn't played Poker for around a year previous to this so, obviously needed to work on basics again.
EDIT**
As for playing without HUD it's okay upto NL10 I think, but you really do have to take some good notes and focus 100%. But with a HUD you can literally just mop up at iPoker, there are more bad regs there with the oddest bad habits than anywhere I've played lately. Oh and I meant to mention all but the NL2 and NL4 stats are Speed poker I believe but will confirm via PT4.