Tell us about yourself!
I see your post is old but you shouldn't vent your oven, a constant temp is important!
You won't taste most of those cannabinoids after making your tincture. THC is what you're really after!
Wouldn't decarb happen when I'm boiling my coconut oil/water/bud mix for over 3 hrs at 212℉?
Do not use isopropyl for anything you're going to put in your mouth! It's poisonous if ingested! It's a poor substitute for ethanol (even for making shatter, imho)!