I am a big fan of the caliper release. I switched from fingers to a ball-bearing release to a caliper release. No contest. I have a pro-caliper release with an adjustable trigger. I use a string loop, too and I switched from the metal job. JUNK!!
First, don't force it. If you aren't comfortable with it, don't use it. If you really want to switch, it will require a lot of practice in the off-season to get comfortable.