I got the 20mm Sapphire over the holiday and got to give it a go. After trying both, I have to say I prefer the 20mm over the 30mm. But I find I actually prefer the SiC insert over the Sapphire in the 30mm. I am running it at 620 and it is flavor time all day long and the dabs... I can much larger dabs using the SiC and find it can handle larger loads and still leave very little left to clean up.
The 20mm Sapphire is where its at if you want a really really good Sapphire dab experience. I honestly feel like the flavor and efficiency of the 20mm Sapphire is on spot. The Sapphire can handle large dabs at 595 and still delivers great flavor. It also does a much better job at using up the material fed to it over the 30mm version.
So if you are going to get the 30mm, you need the SiC insert and once you are up and running, drop it down to 620 and lower to really enjoy the flavors of your dab.
The 20mm is all kinds of perfect with the Sapphire insert and is worth the money as the bang for the buck is much better over the 30mm.
I don't want anyone to think I am hating. Just trying to give feedback so others might be able to save some scratch to put into something else =)
I do not regret getting both versions of the Sapphire insert. Just really really really like the 20mm version
and honestly the SiC insert really makes the 30mm bucket shine. The flavor is on spot and you can party with the 30mm running the SiC insert. It just lives to inhale large dabs and cleans up with ease for the next round.
For the carb caps. So far I am using the storm cell for the 30mm bucket and had to back out the threaded neck piece on the bucket to make the storm cell fit as expected. So if you are having any issues with the storm cell binding or not fitting. Try backing out the threaded neck piece on the bucket and it should fix it
For the 20mm I have still been liking the iDab and something similar to the below
http://thehideawayonline.com/store/sideshooter-carb-cap-by-jon-g-xl-silver-fume.html#.WGLXDfkrL-g
iDab carb cap:
https://www.thedabstore.com/collections/accessories/products/idab-glass-terp-turner-carb-cap
Lastly, Tighten your shit. The tighter the fit of the coil against the body. The better your temps will work and in turn let you get those glorious low temp dabs
Thanks for playing and please drive through