Need serious help on Shyvana please

hi everyone im planning to play this epic dragon on ranked from now on and i need some help and here's my questions. what im i supposed to do mid game when my devourer is complete?teamfight or splutpush? what's the optimal masteries on her?(currently i play her 0/18/12 with stormraider's surge) what's her weaknesses apart from the limited ganks and no cc and why isn't she played alot currently? any good updated link for how to play shyvana s6 would be welcome too. and last question should i go flash/smite or slash/exhaust? thnks for the attention :p
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