Jim, if the Daninject shoots flatter I would think that is just based on velocity. I can pump up the pressure on my X Cal also. However I like to make the hits at what I perceive to be just the right amount of impact. Enough to get the dart to go off, however not so hard as to cause undue injury to tissue.
I certainly would not want to use the Daninject darts. Way too costly. Although each hit should result in the dose being injected as planned. (Dart design is different and lesss prone to a problem)
The Pneu darts don't always work. The other day out of 7 1cc darts 2 of them never went off. The clear body dart made that easy to see.