well, glad I'm not crazy anyway. Maybe I'll go back to the drawing board with my recharge settings. The reason I never noticed this in Types VII or IX is because they spend so much more time on the surface, I guess.
This "mechanic" (bug?) is outrageously punishing with my current parameters - in good conditions, 50% to 80% takes about 2hr, and 80% - 100% takes 3 hr. In bad weather, it took over 24hr to go from 80% to 90%. I'm just amazed at how dramatic it is.
Thanks in any case for the responses
