Hello,
The main problem I see it's that it is impossible to push because of arty and nade spam (from both teams) so I would suggest to increase time between airstrikes and arty.
For the spawntimes, I'd suggest 10-18 or 12-20 in first part, and once flag is secured change it back again to 12-18 or whatever you think it's okay.
I also add here a mapscript file that fixes the sounds (flag captured, tank repaired etc). Basically the one who made caen2 changed the 'shortcuts' inside mapscript file (maps/caen2.script) but not the link to sounds in sound/scripts/caen2.sounds.
It should work but I have no way to test it atm
caen2.script