I find that sometimes you have to bump up the temp on the unit to something a little higher to get the effect you may be looking for.

It's a personal preference thing, and it works better for me that way. I have the analog one and I roll around 7.5-8.5 depending on strain.

I pretty much despise smoking anymore, and the air is so dry and cold here now that the irritants to the bronchi from the smoke make me cough all winter long, so I try to avoid it.

Listen to some of the other advice above, grinding the herb is important, maximum surface area is key.

Good luck.