Of course there is a maximum damage, because stats only get so high. I think probably that is what you are seeing.
I don't see anywhere that +ATK increases maximum damage. +ATK decreases the effectiveness of the target AC so that on average you roll higher damage numbers, but doesn't increase the max damage.
It also seems possible that over 200 strength more strength is half as effective at increasing the damage mod.
When you plug those numbers in you get damage values very very close to what you're suggesting here. Probably we could work it out exactly if you posted the exact stats and buffs and did a long-ish parse on some low level mobs. Your SK magelo, for example, doesn't have max str and thats with a +25 STR stat 2hander. So in an earlier post I don't know what 25 damage weapon you referenced but are you sure you were at max str with it and attacking a mob that had low-ish ac (the low AC won't increase the max it will just make you see the max more often so it takes less time to establish)?
Below is what I think you would expect to see as the max damage for a 25 DMG 1-hander used by different classes with max stats assuming STR is half as effective over 200.
This same formula suggests you should be able to hit for 64 with a 15 damage weapon as a shaman. So maybe you could hit for 1 higher potentially (easier to parse this on a lower AC target) or maybe its how rounding is handled somewhere in the code, but its a very similar result. The +ATK from Avatar should not increase your cap, just increase your average.
Mod Formula: ((Off_Skill+Str(Cap200)+(Str_Over_200/2))/100) = MOD
Max Damage Formula: (MOD*WPN_DMG)+DMG_Bonus
Str over cap below is just 55 strength divided by 2, to account for a softcap.
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