Question 1:
Just as bigbulls said. I set my Bitz with the bottom adjustment at zero or slightly left. The top adjustment is right of zero. Make small adjustments and then place a vane in the clamp without cement. Put it on the arrow and check to make sure all of the vane's base is making contact. I personally like to put as much offset on the Blazers as possible because they are small. I also use the right helical clamp and have had great results with the Blazers.
Another tip. Mark your clamp so that you attach all of your vanes the same distance from the end of the arrow. I also put the clamp on the arrow before cementing to make sure the vane is lined up with the other two.

Question 2:
I have had less than great results using the Fletchtite with carbon arrows on things other than the Blazers, ie inserts, nocks. I think the reason the Blazers are secure is that they have an accelerator on the base of the vane. I have better results with the Fletch-tite Platinum or the Instant Gel. The Instant Gel is basically Krazy Glue and lets me build arrows faster.
And yet another tip! I started using the EZE-Crest wraps and it makes stripping the vanes a lot easier. I just grab the vane with some pliers and rip it off. Peel off as much of the wrap and you can. There is usually some stubborn parts where the vane was glued to it. Get yourself some De-Bonder and wipe it on. Wait a minute and scrap off the rest of the wrap. Presto! Bare shafts again. If you use wraps, I also suggest cutting them down to 1" wide. There is less overlap to deal with when locating the vanes.

Good luck!