1. The spicy flavor is probably the terps of your weed. If you don't like it, you don't like the taste of the weed you have. Try other strains. This is one of the ways the arizer solo line up excels -- it delivers really nice pure flavors. Sometimes certain strains don't taste good though.1 As i say i don't like the spicy flavor i got last night
2 I don't like sucking on the tube i found the diameter very large, feels like a garden host on my mouth
3 I found that the air resistant is much more then my End Game 2con wish is also glass tube and the smoke and taste is much better than the S3 so far
2. interesting... garden hose diameter is usually about 30mm irrc, Solo glass is about 10mm diameter -- much smaller than a garden hose. Anyways, I quite like the size of the glass tubes compared to other vapes, for example tm2 mouthpiece diameter is about 16mm and I don't love how big that is. I suppose comfort of any mouthpiece is going to be a personal preference. If you prefer a smaller mouthpiece, Arizer offers "Tipped" tubes that have a small plastic mouthpiece tip -- you might consider giving those a try
3. resistance from devices can vary quite a bit. there are people who like the Arizer resistance, and others who prefer a more open airflow. The resistance in the Solo3 i think is part of what makes it work so well, but again I repeat -- pack more loosely for a more open airflow. Try putting an empty tube into the solo3 and inhale -- you'll see it's quite open airflow. Then, adjust your loading technique to make sure you're not causing too much restriction.
PS. are you using session mode or on demand? what temperature(s) have you tried using? I'm still learning my solo3 but it's proving to be an extremely versatile devioce for me, I'm loving on demand mode low temp for wake and bakes, I'm loving on demand mode high temp for massive bong rips when I want to go to the moon, and I'm loving session mode for sitting around with friends or watching a movie with my wife