This is interesting. I fully expected my fleet to get severely weakened this turn, as it is at a 4:5 disadvantage in power points
I
think that the view you get of the "Power Points" of an Enemy Formation is strongly affected (on land
and on sea) by the "Recon" value of the units you have adjacent to the NME. I've noticed this on land, and think I've seen the same at sea: as you move more units adjacent to an NME, the "Power Points" value changes. Only when you attack, do you get
Perfect information on the actual types and numbers of NME units present.
And with Naval assets (more so than with Land units), I think you have the added complication that certain types of units have advantages and disadvantages vs. certain other Naval units that are not reflected in the "Power Points" number, per the formula in the manual.