I'm from Aus we spell it the English way. Do you por a drink?, no you pour a drink, then it is vapour not vapor.
Americans drop the u whenever they can. Fair enough saves typing but looks wrong to my Aussie eyes.
I sometimes add a short piece of silicone onto the cooling stem for extra cooling, but I would only add 6 or 8 inch length and it cools well enough for me. You must be fairly sensitive to heat. The j hook should be better because the bend forces more contact. Next option is a water pipe.
The Dynavap stems fit, so search for a dynavap stem with 14mm joint, no carb. Got mine on Dhgate for a few bucks each.