Don't get any more DEX until like... level 100 at the earliest. o_o
Finish out FA first. 19 FA is okay (I saved up my FA points and put in 21 all at once... or was it 18?), but maxed is much much better.
Then you can max PG to save money, then booster, or you can throw a few more points in booster first if you want more duration. Don't worry about maxing Booster yet as it only gives more buff time. You seem like a PG kind of person anyway. =)
EDIT: Where did your points go? It seems like you only used 5 SP between levels 48 and 55.