Thanks so much! I have a hero+ black so i should be good at 1080 at 60fps... or 720 at 100fps!! i think the ability to do the slow motion really gives them that epic cinematic look!
I always go for the highest resolution where possible, I throw 1080p videos up on my 50 inch LCD and they look great. I haven't tried 2.7k because I'd have to have FCP resize for my all the output formats I need, also it hurts in terms of file size for what appears to be very little gain.
One trick I use is also to programme my futaba with half input, so turns etc can be slowed, although I rarely need to use that now as I have got used to the controls it handy for slow flying effects.
Also the old addage that lots of boring practice makes perfect is very true with quad filming; I have hours of me flying round football posts keeping them in the centre of the screen and practicing climbing, spinning turns - if you go to 1:07 on this video https://vimeo.com/73067558 you can see how effective a climbing turn can be - also a pivot on point example works quite well at 0:43 here https://vimeo.com/73031356
As my friends in TV production tell me, its better to get things right in the original filming than to try to fix them with post production effects.