Our AMPS chapter here has a Grex trigger type air brush provided to us by a LHS that we loan out to different members to try out. I borrowed it a couple of summers ago and tried it on a couple of projects that I had going at that time. I prefer the traditional top button over the trigger action of the Grex.
I have a GREX GGS1 handle for my Iwata CS, makes it a lot easier to ‘ahem’ handle, means I can hold it comfortably.
You can also use the threaded bit on the end to adjust the trigger spring pressure, learned that on a hobby club a/b awayday masterclass.
From memory, the Azteks have a chunky handle which should help the hold, but the one time I tried one, I couldn’t get on with it.
I know of one guy who uses a ‘standard’ layout a/b, but instead of holding it like a pen, finger on top trigger, he holds it like a pointy stick, body in the hand, trigger under the thumb. Works for them.
Grex, Iwata & several other companies make trigger action like this Tritium TG3 I have a cheapo version from ebay, about $20-$25 bucks, haven’t used it yet.
Try a local club, or a hobby show, my local one has 2 stockists who are happy to have a couple of demo brushed to try,
I’ve used a Grex TG for the last couple of years. I really like it. The pistol grip and trigger work better for me than the push down- pull back motion of other double asction brushes. It sprays beautifully and is very easy to clean. I’m sold on it !