I have been flying a Sig Something extra for quite a while and would like to get better vertical performance and like to be able to Hover with it. I currently am running a O.S. .46LA engine and am considering either a .46FX a .61FX or a .91FX. I don't care about the price of these three I just want the biggest engine and have it still fly great. Is a .91 to big or can it work.