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Jack rear up as so air can burp to caliper easier. Any flexiable rubber lines expanding?
5/8's for a single piston caliper should be good. run through the basics first, have somebody stomp on the brakes and watch to see if the calipers move around a lot. If they do your mounts are not strait. Also check for high points in the line, these can trap bubbles that may be impossible to get out without power bleeding.
I think the big loop right out of the MC is your biggest problem. You would have to hang the buggy vertical to get the air out of that. A hard 90 out of the MC would have helped a lot.
ya the hoops could be the problem. when i had my v6 rail with cutting brakes i had a hard time bleeding it initially. i had the cutting brakes body mounted very close to level but still wound up with bubbles trapped in them. when i bled them i jacked the rail up so they were level and pumped the foot brakes until hard then grabbed both cutting brake handles and pulled them as tight as i could. that would push the foot pedal back at me when i did this. i had a friend crack the bleeder while i held the cutting brakes tight. not sure if you've tried this or even if this is your issue but if you try it pump the foot pedal hard then grab the cutting brakes and pull all the way and crack the bleeders a few times and see if that helps. now it wouldn't push the foot pedal all the way back i could just feel it on my foot when it happened. the master cyl's in the cutting brakes do wear out as well so also may be an issue.