TH is effected by several things.
VG has less "natural" TH, but can be just as strong as PG if there is a super high nic level (like your 36mg), PGA added, or high doses of certain flavors (Menthol, cinnamon, peppermint, etc)
If you wanted to reduce the TH of your PG
juice, you can pick up some pure VG at most pharmacies (look for Glycerin, 99.5% pure or better), and cut your juice 80% PG and 20% VG, if it's still too strong, you can cut it more, but the more VG you add, the less flavor you'll get.
100% VG juices require a lot more flavoring to be added to get the same taste. freedomsmokeusa.com offers 3x flavorings, and they seem to be just enough for a 100% VG (Or 0%PG as I like to call it) juice.