It is a VERY bad idea to start HP training at level 40. You won't gain nearly half as much HP boost as level 50/60. Sure, you get max HP sooner, but why waste time? It is MUCH easier to start training at level 60, and finishing at level 80, than it is to start at level 40, and finish at level 70.
The increase of HP boost at the higher levels outweigh the quicker level gain.
Also, the Color dragons are very good to train at. At level 80, I could solo red dragons as a black belt, which means VERY high exp gains for that character. However, I recommend Party training at level 60, because chances are, you'll already be close to max HP at level 80.
I also have proof that stats do not max out. My Devout (99 Int, or maybe it is Mind, can't remember >.>) healed the same as my OK. Then I equipped Holy wand and Eldar Staff on my Devout, and it healed MUCH more than my OK. However, if 99 was the stat max, the items shouldn't do anything! Only solution: Stats do not max out. And there are no passive abilities increasing healing ability.
Also, as for Damage proof, go boost twice, use Aura, and OHKO the CoD. That's proof enough.
As for number of hits...It doesn't max out. Even at 99 proficiency.
You should read the HP section more carefully...It does say you can hit 9999 at level 50. Level 40 just makes it less of a hassel because you can hit it easier without having to do selective leveling. As for the hits/damage/stats stuff....those don't belong in this FAQ.
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Also, I think that beating the game before HP training is more optimal, because of the Fuma Garbs/Ribbons obtained.
Ah, and with this statement, you clearly prove you don't understand HP growth. As its been proven time and time again, its based on BASE Vitality, NOT modified vitality. Fuma Garbs & Ribbons (and all other equipment or statuses) do NOTHING to improve or lower your ability to gain hp.