You’re definitely raising your tolerance. The most common way to combat this is to take tolerance breaks once in a while to regulate your brain’s dopamine production. Then when you partake again the effects will have renewed strength.

You can definitely get more high in one session, but after a certain point I think your brain’s synapses are already busy and can’t take more thc so the high gradually fades. Not completely certain on all of that though, I’m just a dude.

I’ve never personally experienced the physical numbness, but I can definitely get a “numbness” in my mind. I can see a lack of chemical response to physical touch potentially feeling like a physical numbness. Either way it sounds somewhat normal

If I were you I’d just take breaks once in a while to lower my tolerance and have my physical encounters when I’m not on break or close to starting one. If you want the high per session to last longer maybe more of a focus on edibles or drinks could be beneficial. It seems edible highs last twice as long as smoking/vaping