RE: No cable guard bows!
My Martin Sceptor nitrous x has the long axels and I still need to use the low profile vanes to get clearance with the 2613's.
This is one of the objections that two of the Martin team shooters pointed out when I asked them why they didn't shoot the x on their indoor bows.
I don't have a problem with it and the x system works for me. Others will have different results.
Learning to load the arrows nock first was no problem. Don't let that keep you from trying a bow with no cable guard.
Good luck,
Allen