About another 5k arsons from 55-60, but to be consistent in a PA team (without insane CE friends carrying you) you'll want between 20-25k after that to be a comfortable 4th, ~30k total.
Yeah.. searched for this info a couple times.. This is the first answers I've saw... dunno who got all the time in the world too search for this stuck by scrolling...
As for the PA/PH... I've just recently joined a PH team and was successful (just before getting to 55nnb was my first) but you'll need a very strong team.. i wasnt even involved when I read through it... Thanks for the info guys... very helpful