Leaky master cylinder

ill probably get a new gasket first. I dont think it clamps down hard enough on the cap tho but not sure if i can fix that. Also i put a little bit of Teflon tape on the threads before i screwed them in if that would make a different? Not realizing that its all flared and should just seal itself. Also it tends to happen more if i do a burn out or holeshot if that makes a difference...