Do you already run any of Chris' fps configs?
If not I'd highly recommend them, https://chrisdown.name/tf2/ you can fine them all there, they aren't completely up to date though, I believe mat_phong 0 is one of the commands not in the configs.
I'd say go for maxframes and see how that works for you, if it's still not enough there are various other tweaks you can do with your graphics card.