This actually sounds very interesting! I do my warm up in the shower every morning - as hot as I can stand. During that heating phase I perform manual stretches. After the shower I wrap with an ACE bandage until I put on my ADS. I wear the ADS for about 9-10 hours a day. I have noticed that between the stretches and the ADS there is still a considerable amount of retraction in the wrap.
Your “experiment” may prove to eliminate some of that retraction after the stress of the weight is removed. If you use heat during your hanging sets and then allow one set of “cool down” under tension so that the ligs remain stretched as they are allowed to cool down, in theory, you should notice a significantly longer flaccid length. This would be true if the effect of the heat was to relax the ligs and allow for a greater plastic deformation under stress.
Instead of golf weights, why don’t you add a hanging session or use your last set as a “cool down” set for a specified amount of time (weeks) and see if your flaccid length does not improve. This could be a very interesting study, and I would be very interested in finding out how it goes. I would do it myself, but I have another experiment of my own already planned for January 1st through March 1st. I guess I’ll have to try this one next.
Keep us posted! Good luck! (as if luck had anything to do with it…)