Ok i finally finished the mission. It was a very very well made mission but there are a couple bugs that need fixing.

1. The objectives can only be captured with stock units from the game. The Lehr infantry can't capture objectives. I had the map 100% cleared of enemy units but capture points refused to be captured unless i placed a stock rifleman unit on them.

2. The Panthers can't be fixed. I had two tracked Panthers that i could not fix, even with a new tank crew or the engineer vehicles.

3. Too much artillery. I already explained it in the comments.

4. The spawn point for the Curchills and extra infantry should be moved off map.
It's weird when you capture the whole area and they spawn right in the middle of you.