Dear synthege,
first, I'm a NL Hold-em player . But like you said, the same thing happens in NL Hold-em as well.
I think you should just get back to playing tight(er) again. It's happened to me as well. You get very Loose-Agr. and steal a lot of pots. Then it's kinda hard to get out of that gear.
I guess you should just back down as soon as your ITM. Because like you said, the other players will play more as well.
Something I find very usefull is sitting out as soon as your ITM, then go get a drink downstairs, and after 1/2 hands you'll be back ready for a fresh start
Switching gears is an important poker skill, but this might help you in the meantime
Good Luck!
Hope this helps.