I use a vac chamber for the RTV, I mix up a batch, vac it, making sure the container will be big enough because it raises dramatically.
Then pour it into the masters, letting it puddle from the bottom up, then back into the vac chamber for another suck.
The chamber I have is an old vintage pressure cooker, it has 6 wingnut dogs, and is extremely well made, heavy and solid. A one inch thick Plexiglas lid with fittings for the vac gauge and hose was made for it.
The pressure pot I use is the cheapo from Harbor Freight, I have gone through several over the last 20 years, the only issues with them is the consistency of quality. (check the wing nuts before buying one) Sometimes the seals have to be re-set and I have a mark on the tanks for the alignment when I place the lid on the tank. Once I pour the resin mixture into the molds, I tap the sides (and sometime squeeze the molds) to help release any bubbles.
I have almost no issues with trapped bubbles...
I also use Platinum cure RTV, I have an old cookie sheet my wife was tossing out that I use to fast cure the molds. I have a space heater that has no elements exposed, the sheet sits on top of it and is the perfect temperature to cure the rubber in about an hour, it also keeps my casting room the correct temp for the resin
I know the "big guys" may do things differently, but this works for me.