OK no more obtuse stuf -
Basically -here is what I am trying to say -and if it doesn't make sense to you -it's likely you don't ever try any hands on experiments.
In our models - futzing with airfoil -is a nice way to pass time -but actually the finely developed airfoils for full scale stuff it of no advantage .
those shapes were done for FINITE purposes.
based in almost every case on power available and weight constraints.
trying to fix an overweight model with some better airfoil is 99% a waste of time .
add more power to a too heavy setup?- -it just changes the crash speed for most.
the real criteria for decent flying models is the same for decent flying full scale aerobatic stuff -
Keep the fu-- weight down.
the rest is secondary as is any "critical" cg.
The CG usable envelope increases with lower wing loading -
doubt it all you want -

so -still doubt it?
try flying more and cogitating less.