To fix the Rak cheese all they need to do is buff its accuracy and a bit extra when attacking out of stealth and make it immobile. The thing is pretty decent when it hits but the ground receives more shots than anything. Creeping death is simply cheesy and if it's there to make up for its poor performance it seems like buffing its performance is the best for both parties. Making it immobile when camo but effective promoted planning and ambush, clearly its not to be like other AT guns so let's just make it effective at its intended role already.
And give it back its +5 range at vet. This thing dies to a sneeze at least reward keeping it alive by only being slightly shorter range than other AT guns...
Raketen can't be fixed. The issue lies within the low profile of raketen, those ground hits aren't misses but collisions.