Yeah, I'll have to just keep trying with the Gustav...
Do you use tracers, or have you just learned how to lead better? I probably just have to keep practicing and learning the rockets better.
I don't usually use the engineer on that map, because the mines aren't as useful and the repair tool goes unused a lot. Most of my rocket launcher use has been killing tanks up until now since I miss on copters a lot. Just have to suck it up and keep shooting I guess.