Well, economy aside you took scrimmages from play off teams. That's not good. Scrimmages can be important and be cornerstone of someone's strategy. And there could be major problems regarding game shape. This could even influence bench structure and number of players on roster for some teams. I think it shouldn't.
How about scrimmages are a complete waste for anything other than training...
I'd rather 3-3-3 with games being played on Thursday, the teams that get knocked out play series against other teams that get knocked out as well as a similar set up for the bottom 4. A 5 game finals series is a bit excessive. I hate sudden death and I don't think it has any place in this game other than the cup (still have nightmares about going 20-2 in Div II and getting knocked out in the semi's). Having the home team just be from the conference that won the All-Star game is bad.
Below is a suggested finals schedule4/11 - round 1 PO7/11 - round 2 SF game 18/11 - round 2 SF game 211/11 - round 2 SF Tie Braker14/11 - Final game 115/11 - Final game 216/11 - Final Tie Braker
Of coarse it would be hard playing 3 compeditive games for up to 3 weeks, I guess the guys in the B3 already do that though, and everyone would be in the same boat.
Despite that you answered your own question, it would mean sitting some of your players out, or start them on the bench, in effect managing your line up as you go through the finals to make sure you get the best out of your team.
In my league the team that knocked me out in the semi finals completely changed his back court in the first game of the finals, relying on his tactics in order to rest his regular starters, making sure they were fresh for the 2nd game.