-I haven't played this new format yet ,and to be honest it will take a long time to even try and think of a deck, so my opinion is based only from experience and some simple math.
The staff saw that at their attempt to remove the old Uppers
domination at the DT's rooms they have created and even bigger domination, now that the timer has reduced. It was only inevitable to change some of the rules. Apart from the fact that they are not that bright it's still an attempt for correction.
The old Uppers
domination is already at our doorstep with Jackie's legendary return. Why should I care for the -2 points now that I will surely get at least 21 points a game? 21 points in 2 minutes.. Do the math for an average of 40 pts in 6 mins(a not that optimal scenario) easy 400 points for and average player in a pretty shitty scenario overall.
I am not done yet. This will not erase the low star domination either. Decks with an 8 damage card are still powerhouses as they give the fast scenario to a low star decks. (still haven't tried but that may be my take)
Oh and lets not forget crazy imbalanced 2HKO decks that were used when the new format came...
P.S. I do not know if you already have, but next time IF your point is to improve the game put some good players' opinion into consideration. They might actually help you to it