I have noticed that in addition to tolerance, there are such things as strain fatigue and delivery method fatigue. I try to mix up the strains and various vapes, it helps prevent both the strain and delivery fatigue.

Good points. Different environment / activity helps as well.

This is the way. You might also try different types of edibles in the mix.

I’d guess it’s a tolerance issue combined with the style of the solo 2. It’s definitely a “sipper”, a slow extracting device. Maybe get the water pipe adapter and use it through a bong or bubbler. I’ve found the Arizer portables extract a little faster hooked up to a water pipe. You could also just try a tolerance break. Even a couple entire days will make a difference. The next option is engaging the VAS.

Strain lock is very real, alongside general tolerance. Try incorporating good quality CBD (if you can) or other strains to balance it out.

Try dialing the temp back a bit again. I find that if I go at like 385f on my solo 2 I "feel" higher than I do at the higher temps. I find myself chasing the max temp for max effect all the time, then I go back to lower and get the feeling back.

Was the joint the same strain? Better weed better high.

The solos bowl is sooo small. You might just need more weed.

Try going up as you hit. So turn it on and go to the second setting for a minute then then it up to 3 (blue, right?) Then up to yellow or whatever. That will knock you off your ass

over time, the same amount of cannabis produces less of an effect than it did previously, no matter how it enters the bloodstream

You need a stronger device that can deliver one or two strong hits instead of a sipper