if you wait till the play-offs before boosting, you will be at a much higher level.
especially your first season, you will waste your boosts using them early, becuz at level one,
you will get to the next level in about 2 games... you don't want to waste that period of easy level gaining!
the higher you get in level, the less of a difference it makes if you wait to boost,
but in your first couple of season, it makes a big big difference, so wait till the play-offs!
the strategy i used was to wait til the play-offs to boost,
until i got to level 22. then i boosted immediately to start getting VA!
once you are getting down to near 100 xp per game, it doesn't make much of a difference anymore when you boost,
until you are getting 100xp a game, at which point it makes no difference at all
so you might as well do all your boosts right away...
this is my QBs 5th season coming up and i'm gonna boost day 1.
but if i hadn't been patient early on and waited till play-offs to boost, i'd definitely be a few level lower than i am now.