Changing gear breaks the mana regeneration and damage

Hello,

I changed a body armor with better stats than the old one and even if I have better mana regeneration it will consume all my mana and with the previous body armor it did not happen.

With the new armor I have 2150 mana regeneration per sec, 427 mana cost per spark and 0.21 cast time.

With the old one, I have 2050 mana regeneration per sec, 419 mana cost per spark and 0.21 cast time.

Why would the mana regeneration start dropping with the new body armor?

Also the DPS when using Sigil of Power does not change, it will only change if you switch on the secondary weapon.

**Update**: I reduced the mana regeneration from 2150 to 2087, it seems there might be a mana regeneration cap at 2100. If I remove Mind over Matter, I have like 4200 mana regeneration and it there is no issue there as well. So, I think there might be a mana cap.