Explaining How Concentration Works

So I was looking around the forums for an explanation of how concentration works and I saw many people saying different things so I went and tested it myself. Skip to green for conclusion.

For this testing the weapon I used was salvation. The only thing that really matters is that the water damage is 36-36 and I had 0 points in dex so I always did 54 water dmg on every melee attack (36 base *(1+0.70 dmg from Int-0.2 from Aquarius ID)).

With the t6 powder special on Aquarius casting a 2 mana spell increased my dmg to 56 water dmg. As I continued casting spells in about 1 second intervals the dmg kept increasing up to 108 water dmg at which it stopped. If I stopped casting spells for a few seconds while casting the dmg would reset back down to 54.

What this means:
With T6 powders casting a spell increases your water dmg for 5% per mana spent. The duration of this buff lasts as long as the mana spent example: (2 mana lasts 2 seconds). Casting a new spell before the buff wears off changes the duration of the buff to the new spell cost example: (3 mana spell changes 0.5 seconds buff duration to 3 seconds). This damage can stack up to a maximum of 150% water dmg. Wearing multiple pieces of armor DOES NOT increase the damage cap but allows you to stack the damage faster.

Anyways I think that's it let me know if you have any questions or conflicting test results.