Really recommend the Explosive Enterprises video on the VFC M249, (and the follow up video). Tonnes of really solid advice including getting it set up on HPA.
Tbh I'd leave it alone as that equals 1.05j. You won't need to up the muzzle energy much before it becomes too hot for 99% of sites and that small increase will do bugger all to increase performance. If you need more range then you're better off upgrading your hop up or use heavier bbs (note joule creep from heavier ammo might make the gun hot so you'd possibly need to dial the psi down)