I'd invest the 4 EVs into Defense, myself. It's best to make sure Defenses share the same general base as HP before you invest in the HP stat. Investing in Defense at this point actually means a tiny bit more bulk.
As for the moveset, I'd say this is good. Taking a Defensive approach is good too:
/ 252 Special Defense / 252 Speed / 4 HP /
Flamethrower / Heat Wave / Fire Blast
Energy Ball / Solarbeam
Just giving another option, since your offensive set is good too.