should i get a retune?

last year i had my mustang dyno and tuned.I made 483 hp and 455 tq.I had issues with spark because I was running the stock ignition system.I was able to get some pulls by gaping the plugs to 18.Over the time I up grade to a msd digital 6 box,and fixed up some other issues.The car runs and pulls great but wondering if i should go for more.My tuner says there is still some power we can get but its going to run me 275 to get it retuned. Should i go back or put the money towards something else.

combo is
Here the info on the setup
3,000 mile 306 with twisted wedge heads
Holley Systemax 2 intake
Stock cam
Ford racing 1.6 rockers
trickflow valve covers with a breather on each side and no pcv
Accufab 70mm tb and spacer
Power adder
Vortech S-Trim with a 2.95 pulley pushing about 14lbs
Snow performance stage 2 kit with maf controller
60lbs injectors
Sct 2400 maf
Anderson 4” power pipe
Exhaust
BBk LTs
Bbk xpipe
Bassani mufflers
3.73s

thanks
jesse