Since you have a decent driver you might consider some improvement on other clubs before upgrading the big stick again.
I'd suggest you to get a 3WD (G15? G20?) and two short wedges (from lvl 38 ATV up - your choice). The wood will bring you closer to the greens and the wedges help to hold them and get close to the pins.
Using some custom balls certainly would help your game a lot but even the cheapest are equivalent to a constant leakage in your purse. Your decision.