Multi Table struggles

[BobbyTheG]

I have been very successful at one table SNG and am a successful 10/20 player. I have been struggling mightily in Multitable events. My problem seems to be that my tight agressive style doesn't afford me enough chips with aggressive blind structures. I have won an event in Vegas when we stared with $6500 in chips, blinds started out $25/$50 with 30 minute rounds. My style worked great, slowly building a stack, double through once when I hit a set with QQ, etc. When it got down to the money, I opened up and used my stack to pound on players (FUN!). I normally do very well in these structures.

I find with the multitables with low chip counts ($1000 or $1500) like on Party Poker or Poker Stars and with the blind structures (15 minutes) that I have to basically get hit by the deck to get deep into the money. I have finished 2nd once with 300+ players, but most of tourneys follow the same pattern....win some hands, double through once or twice, have about $6000K when the blinds get to $300/$600, hit any kind of cold deck and end up moving all in. I usually get it in when I'm ahead, but if you do it enough, you are going to get clipped. Obviously, if you move all in with AQ, you are going to get knocked out by someone with A9 enough to drive you goofy. I end up having to push with A-x or a mid pair, or I get a big hand beat, but don't have enough chips to withstand it.

Should I be stealing late more? It's so hard to raise from cutoff with K4 and make it $1200 to go when you only have $6K, but maybe I'm just playing it too timid and need to just let it fly a little more. I'm really struggling in these smaller chip amount/fast rounds type buy ins and my confidence is a little shaken so I'm looking for some good solid simple advice.

This email rambles a little, so I'll put some questions up for discussion:
What is a good level to start aggressively stealing? I feel like it's maybe as early as $25/$50 but my gut says $100/$200.
What % of your stack should you risk a steal with?
What types of hands should I look to steal with? I'm thinking I would want to steal with hands that could improve like K-x suited or Q-T.

Sorry, these are pretty basic questions, but I'm looking for some input. I just can't seem to transfer my success from SNG, 10/20 and high chip/long round tourneys (which are tough to find) to the $33 multi's on the web.

I'd love to hear from those having success at these. Thanks.