LostinTheDesert

I have a 2011 Dodge Journey Mainstreet with a Chrysler Pentastar 3.6 vvt V6 suffering from the Oil Filter Housing\Oil Cooler failure; iirc bad design leads to damage to oil filter housing\oil cooler due to easily overtightening the filter cap, and causing damage to the housing\cooler and leak of coolant (and maybe oil, but I'm not sure). My problem is in the block and bolt threads. Upon initially installing the new unit (fancy aluminum job, 'sposed to be better), a thread in the block would give when almost to torque. Following the recommended pattern for the 5 bolts, and tightening only handtight (in pattern) and slowly seating and snuggin' and re-checking, 1 or 2 at a time they would strip. This is only 7 ft lbs. I got a helicoil repair kit for the size needed (6mm x1) and soon found out that someone else has done this before on this engine. VERY Carefully, I cleaned out the block holes, carefully re-drilled and tapped them, and using new bolts for this engine (anyone know where to find them under $10 a piece?) began again to install the part. And every time at least 1 bolt or thread\helicoiled would strip- I think the bolt because of the depth of the helicoil and the little tab you have to knock off, might have done the bolt in. I've read ideas about things like setting the bolts in the block and attaching nuts to their end to fix the part into place, or going a size up (which seems to be 8x1.25?) which seems like a pretty big bolt; will I have problems leaking because of torque? Does torque change when using a larger size bolt? Should I try a different type or size of thread repair and what kind? Should I use some kind of loc-tite and the same size helicoils? Thanks in advanced.