I agree with Tacx, for what you describe then there isn't much benefit. However, my cocker remains my best shooting marker because I've spent the time to get it shooting how I want it. Shoots +/- 2-3 fps, ball on ball is amazing, and the timing is tight enough that I can easily rip at a solid 6-6 bps without any effort (going higher always seems to lead to short stroking).
Paint quality has less effect on my cocker than any other marker I've ever played with, even with dimpled paint I can shoot peoples barrels sticking out from a bunker from 40-50 feet away pretty consistently.
If you interested in getting your marker running better then upgrading is likely to make that process much more simple. If not, I would say no. If it shoots paint well enough for you then just keep playing.