I am just having a quick look at gazala line; I will send you my replay after i have finished. my basic strategy will be as follows:
In the north use the two free 'group hecker' to land on the spur undetected just north of gazala itself. Use the free 14 strength shutzen brigade to destroy the minefield at 15,11 backed up with some arty to supress the 7.2 inch at gazala.
The trick in this scenario I think is not to spread your forces thinly across the whole perimeter but to use the two deployment points in the north near gazala to (you dont have to deploy everything in the first turn); in the appropriate order introduce the right supprting arty to blast a whole in front of gazala. then use those two placement points to introduce your armour to pile through the hole and finish off clearing out gazala. This is done very fast so the specific order of deployment there is important. then take some of the armour north through the gap in the escarpment to deal with some of the armour there and also take the perimeter line from behind. (they dont like it from behind mr mannering

the remains of the armour plus some arty and a couple of infanry I would take stright to tobruk and then bel? and sidi R?.then when they have those they can swing south and deal with more armour and various other secondary objectives and bits and pieces. The secondary objectices are important in this if I remember correctly as there are free prestige/capturables. However if you are struggling with this scenario it is best to do the basics and ignore the frills. In the centre 22,26 I would give it some extra arty and an88 as AA to protect the arty to slowly slog away at the fortified position using the italians as cheap cannon fodder. It will crumble eventually but will take a while.Also initially i would concentrate my airforce there as there will be the main initial attacks. After some of the enemy planes are down I would send the airfoce north then east using the airfields at gazala and then tobruk. the regular air attacks are spread out alot then so you will have to cover a large area in the rear and their airforce is strong. In the south I would place one pioneer, one other infantry and a couple of arty to take the fortification at bir hacheim, the pioneer getting a hole in the minefield. I would also have one tactical bomber (the free one) to help there. overall you need to be fast in the north and slow in the south to do it cheaply and not take much losses. There should be plenty of turns. About half way through the enemy will cleverly send some paras to retake your airfileds in the center, easily defeated but irritating.
edited:
I have a run through of gazala line at field marshall difficulty it is a DV at turn 29. While it certainly was the physically quickest one I have done it was very far from my best with lots of rushed/careless mistakes and i even let the enemy get behind my lines! which led to lots more prestige recapturing. It is enough to get the idea of a workable strategy for a DV on this one. Oh and its from Nikivdd's DLC upgrade project version of afrika corps which is actually slightly easier than the origional as you start the dlc with a three very handy heroes. For some reason it wont let me attatch it here but if you want I can attatch it to a PM. let me know