I agree with the high starting tickets + fast ticket bleed idea for hoth.  It would force the gameplay to have a faster pace, and I think this would make Hoth much more fun.  People would actually be trying to take echo base instead of just taking all the other points and then camping outside.

Also, since the shield generators protected Hoth from orbital bombardment, would it be possible to say, give the Imperials artillery after the shield generator is destroyed (Artillery = Orbital Star Destroyer Turbolasers).  One way to do this might be to make the shield generator mesh initially covering/blocking the imperial artillery mesh/gizmo/something so that it can only be repaired (activated) once the generator has been destroyed.  Provided that you can make the artillery gizmo initially spawn as being destroyed (unactivated).  I think that this would make the shield generator a much more valuable asset to the rebels.  In GC, I don't think it was ever really protected.