A little food for thought
We have designed a number of models for contests whre the total outlay in time and money -for the flyer - is substantial.
The biggest single part of each design was always "how do we reduce weight whilst retaining necessary strength.'
fussing about best airfoils? - - just make it as thin as possible .
The higher you go - the faster it must fly-to get same lift - so the airfoil is a compromise -always. Ideally the wing would have an adjustable camber - but THAT is heavy.
The one thing that is a proven constant - the lighter it is the less the airfoil matters .
Once you get all the hardware sorted out - get a guys who is really sharp at structure and then layout the strongest ,lightes setup
if it is light enough -the other 'fine points don't matter.