Change between Vent & Power domes without (target) program change

Hi,

Better speech in noise is my goal, I know it is the Holy grail but just want the best I can do.

Wondered if you can change between vented & power domes, on the fly, without program changes or will the results be poor.
I don’t have any power domes, think most of the time prefer vent. I hate the occulsion effect.

Been using “Open” since low to moderate hearing last 10 years, 60 years old now (not got much worse) though struggling more with SiN so moved to Vent recently during hearing test but actually had bad occulsion so a few weeks later I programmed myself & went back to open dome, been a few months but noisy environments are just terrible so re-visiting.

Wanting to try again so just changed to a Vent dome without any programming and the occulson is not a problem? Speech seems better but not had a chance to really test.

I wonder if I program back to “Vent” (from open) if this will bring back the occlusion, does that setting make much difference.

Which leads me onto my question really. If I got some power domes & wanted to use for those nights out, would it work better without the program setting.

Also wondered about getting custom molds, again hoping to switch between as the need arrises.

Sorry bit unlear but hope someone can advise.