I'm not a big fan of boosting new teams; despite I'm not a big fan of the manual time it takes to level either but I do belive that those progress levels is very handy for trial and error. It dosn't sound as you're a pro-boxer yet so I think that from 60 and fourth you should have the hole team. You can learn a lot by actually boxing rather than jumping in at 70+ a lot of trial and error; Only so much you can read, copy paste & understand at the same time.