Just another view point. Since the Training Blessing doesn't apply to planes, I've got into the habit of attacking in multi-player battles without planes (similar to how I don't use mercenaries or tactics for multi-player battles). And, I'm personally finding it helping me get better at attacking without relying on planes. It's kind of like practicing battles on hard mode in multi-player.
But, again, I'm not climbing medals, and I keep them moderately low, so, this might not apply to those climbing medals.
Maybe, something to consider.
Cheers and happy gaming!