Finally did void. I got so frustrated by the bossfight ( either rathma wtfpwned Mendeln in the first 2 mins or i played it perfectly but then I died like a dumbass when Rathma just killed Mendeln and was about to die himself....) that i gave up on it for a week.
The Str craft helm was a fantastic idea, Aerial. My raw damage output was unaffected by it directly (Idol of Rygnar gives a nice dps boost by itself) but i was able to wield my gotter in combo with candlewake, increasing my average damage output by about 5k, which was huge for me.
Looking into the belt slot now, might do another str craft depending on the rolls. I'm thinking about making one with honored system with UMO's, but i dont have the good UMO's yet
EDIT: did some str crafting and compared a few setups:
the belt has 24% to str (with lah runes) and + 90 flat str (after MO's) + 1 barb skills
the helm has 17% to str (with no lah runes, i needed sha for IAS) + 113 flat str after MO + 3 barb skills
- str craft helm + marchosias belt: 32k to 44k buffed damage w. bearstance
- str craft helm + str craft belt: 32.2k to 44.6k buffed damage w bearstance: an increase of approx 1.1% as compared to the first setup
- Idol of Rygnar helm + str craft belt: 32.4k to 44.8k buffed damage w bearstance: approx 2.3% increase to the first and 1.2% to the second setup.
defense stays roughly the same, damage increase is not significant, especially with the loss of the 5% bladestorm proc. My overall clearspeed went down by 1-2 mins in fauztin.
So overall, despite not using the marchosias armor, i'dd still use the belt regardless of chest armor. At least, untill i can get my hands on some UMO's