The act of vaping actually decarbs the bud, Save it up and make salve out of it!
Welcome to ILGM @FazerPete Sorry to hear about the Huntington's. I'm sure you can get some relief with MMJ.
Another thought is dosage. I think most of the bud vapes hold at least a half gram. If you run it at a lower setting (Most have three settings - more or less) and hit it easy a couple of times, you will also get a smaller dose. Turn of the vape and dump the bud out as the chamber will stay hot for awhile and continue to keep the bud hot for awhile. When you need more dump the partially used bud back into the vaporizer. If you leave the bud in the vaporizer it will get all sticky inside and require more frequent cleaning.
Which vaporizer do you have?
What percent of amber are you thinking @Majiktoker