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Massive Crits
In my testing with Massive Crits I have found that when there are multiple Massive Crit modifiers on a weapon the game uses the LOWEST modifier.
I tested Greataxes. One with only Massive Crits 20. The other with Massive Crits 5, 10, and 20 on same axe.
Base dmg was 1d12+12. Max crit with base dmg = 72.
Max crit acheived with the single 20 was 92dmg.
Max crit acheived with the triple Massive Crit axe was 77.
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Bonus Dmg
As for using same dmg type for bonus dmg, the results weren't as bad.
I found that bonus dmg of same type didn't stack, but used the highest modifier.
Again, 2 Greataxes. One with +20 slash and +20 pierce. The other with +20slash and +15slash.
Again, base dmg was 1d12+12. Max base dmg = 24
Max dmg achieved with the 20slash/20pierce was 64 dmg.
Max dmg achieved with the 20slash/15slash was 44 dmg.
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That being said...
This could use a little checking:
