I changed some of those a good while ago, when the parts, especially fuel tanks, got more massive; something with high mass values and the physX calculations was causing individual connections between parts to act weird; either failing ot pushing a large amount of force onto a neighboring part, so certain structural pieces had to be unnaturally toughed up. I expect that's all solved now (hopefully) thought it might be worth a playtest with a crazy large rocket stack. (This was before you could hide strut connections too, so there's that)