Changing styles from NL cash to CL tourney

[mojo]

Played in a home game last night. NL, blinds .25, .50, buy-in was $20. I killed, left with $87. BUT, when I play in a NL home tourney (with other friends) I have yet to win. The tourney structure is blinds start 25-50, start with 5000 in chips (blinds basically double every 20 minutes). Two tables of 5 or 6 players each, final 3 players from each table make it to a final table of 6 players. (Would this be more similar to STT, MTT, or something like 6Max?) Anyway, I can make it to the final table in this game but then don't make it all the way. I think I need to loosen up when the blinds get bigger relative to the stacks. Why can I win the first game but not the second (I suspect it's related to me playing better cards and the blinds not increasing). Any thoughts or point me in a good direction for help (book or STT forum of course)? Thanks.