Im currently running 1 inch drive spacers and -2 lowers on my 2003 top gun with its. Does anyone know if I switched to 1/2” drive spacers if I would pick up any speed? Would I gain enough rpm to go up to a bigger set of props? Looking for someone with real world experience.

IMO, a half inch won't give any significant gains. It may even slow you down because of increased propslip.
No real world TS Gun experience, but its still only a 1/2 inch.

I'd say depending on the wheels you have on the boat, you will have trouble getting on Plane in rougher water because of the prop slip and x dimension They won't bite as easily. You might pick up 1MPH, but that is all. The x dimension on the TS are really set at a good spot. I personally wouldn't spend the money. I run -1 IMCO's on my TS.

What prop, gear ratio, ? rpm @ wot ? how much hp ?