Hey Mike,
One thing I forgot to mention. I remove the rubber dust cover completely and then push a good bit of grease around where the bleed screw seats. After cracking it open, I push the grease again so that it gets drawn in for a tight seal when I close it. I also run my finger around it occasionally to keep the seal.
I've found that the bleed screws don't seal all that well once you've cracked them open and this may be your air issue.
Give it another complete sequence with the vacuum and the squeeze/crack/hold/shut routine with the grease added.
btw. my brake line is 4" over stock.
