I'm attempting to put a tanker into LKO to service my interplanetary transport ship, but I keep running into the same issue. The goal is to get a full orange tank into orbit, but my mainsail engines keep plowing through my stack. My lifter is pretty standard: four well-strutted 2.5m boosters, each three Rockomax Jumbo tanks tall, around a core that is one orange tank on top of two Rockomax Jumbo Tanks. Each stack has a Mainsail under it. Has anyone else run into the issue of mainsails causing their stack to accordion? What causes this? Too high of a TWR? Too much thrust under a heavy payload? The ship has very little wobble as is, so I'm having a tough time trouble shooting. Thanks!