I've been away from the game for a month or two while my video card was being replaced. Is there some sort of change that has occurred that requires more Delta V to get a rocket to space or am I just having trouble? I was getting there with 3300 to 3500 m/s, now it is in the 4000 m/s+ range. I find myself having to provide a larger and hazier safety margin when I used to be able to build everything at a delta v budget of adding 10% to my estimate and being good to go.