There is definitly a problem with the drag cube. There is a little bit of drag, but not enough to slow down the craft for a landing. Even in low atmosphere the Craft is flying with nerarly orbital speed, making it impossible to release the chutes.
If i activate the "Replace Drag Cubes With Sherical Model" in the cheat menue (ALT F12) under Physics, Drag, the craft is slowing down, and everything is fine.
Besides of that, very nice mod.
EDIT: Tested around a little bit. The problem is caused by the heatshield. Without the heatshield everything is going well. When i activate the Sherical Model in the cheat menue the capsule is loosing drag now.