Tight issue on the 32mm ID WMC indeed occurs whilst partially contracted.
I place my WMC's on the central heating radiator, so they warm up nicely .... besides that I do some manually stretching exercises before putting on my pre heated WMC(s).
On the pinch issue:
I been reading your topic but I can't make a turn, I really need to squeeze the skin into position to close the assembly, sometimes the connection pin doesn't even reach the hole on the other end of the assembly. However once in place and lubed up it fits good. I'll try and shoot some pics sometime this week to show you exactly what I mean.
To prevent (skin stretching) pain as described above, from wearing one 30x32 and two 15x34 on top of that (tot. combined weight of 883grams) I've now strarted to wear my 45x34 at 753grams. This weight increment is doable and isn't causing any (skin stretch) pain as it's much closer to the 681grams I'm used to wearing for several months now (one 30x34 + one 15x34).All I need now is a way to prevent slippages of my 45x34 WMC, cuz I reckon they hurt like hell as the testicle needs to travel 45mm is confined space before it's free again. I already cut down significantly on the use of SheaCoa on the bottom side of the WMC, in support of preventing slippages to occur and I must say it does help but isn't idot proof as after several hours of exposure to the weight the smallest of my two testicles starts to slide into the WMC and I have to remove it to prevent slippage (read lot's of pain) - any other recommandations to prevent slippages are welcome !
Having said that, I reckon it's a perfect way to have my enitre scrotum (vanes, skin and so forth) adopt to more weight without taking any risk of tearing myself. In time I'm positive I'll be able to wear 32 or even 40 onces.