I wouldn't waste my time with a girdle or even caps. I considered all those options for my build, and they all seemed like band aids to me that have no proof they even help.

I settled on a half fill, and im using stock caps and bolts...Might change to main studs, but thats about all I would do. A girdle or caps imo aren't going to do much when it seems the problem area is elsewhere in the blocks.

I would run it as is, especially if it only sees 15 passes a season and no street miles