Didn't we speak about bet sizing in another thread?
Bigger raise size, and if you plan on raising this flop be prepared to call a 3-bet shove considering his stack size.
If you're worried by KQ/77, especially seeing as you have such a small sample size. Flat flop, eval turn. You've got position and if by chance a diamond spikes the turn you still have NFD and TPTK.
Honestly though, if villain takes this line and I've raised a donk bet on flop then I'm probably calling it off, look at KQ and hit runner runner diamond to scoop