Hey nedgo! Welcome to the forum!
Disclaimer: I am not a pro.
Amazing Clear Cast resin is okay stuff so I've heard. It's more directed for the audience that shops at Michaels and such.
As for other resins, I recommend looking up Smooth-Cast by Smooth-On. Another one you can look into is Alumilite.
There are plenty of other options on the market, and really, it is up to you, to decide which one you like the most.
With Smooth-On, usually they offer each line in three speeds. Fast, medium, slow. They correspond to the working and curing time of the resin.
The slower, the more time bubbles can rise to the top and pop, but in your case, you don't need to worry as you can degas with your vacuum chamber I believe. You just gotta allow room for the resin to rise up, and perhaps reservoirs if you're going to vacuum your resin.
Clear resin is more bubble prone.
Viscosity affects bubbles.
Talcum powder in your mold, then tapped out, will help the resin get in every nook and cranny.
Last but not least, a drug dealer digital scale from amazon will do wonders with resin!