when i first started with jknives, my sharpening skills were horrible but i could still get a sharp edge. well as sharp as the edge might have been, my knives still didn't cut very well until i eventually started thinning and altering the geometry not understanding what i was really doing or why it worked. basically got the 'ah ha' moment by sheer luck/accident trial & error. i now have my own technique and pretty much sharpen every knife the same and get consistent results regardless of the blades original geometry. they each cut slightly different but the performance is at a level where i am comfortable with.
i don't rotate out different gyutos for different tasks, i just randomly choose one for what ever one i feel like using. the one gyuto i consider my best performing one, i only use for mass prep work as it's really too big for most things.