Load up your 10-tank Artillery team, and lift them off. Until they arrive, have your MBG do nothing more than hold off approaching threats. And have your trucks put up more howitzer emplacements, and a Sensor tower (where doesn't matter, just make sure it can see a large part of the enemy central base, and is NOT the closest thing to said base, so that it doesn't get shelled).
Be VERY careful not to get too close to the enemy lancer towers during all this.
The reason you are not pushing east (whether or not the cybrogs have attacked yet) is because there will be an enemy heavy-tank group there waiting for you; being on Tiger bodies though, they move REAL slow. That said, it's a good idea not to engage them until you have the central base in pain, as you don't want a 2-front fight on your hands. You can, however, reinforce the anti-cyborg eastern defenses with a couple lancers if your trucks are bored.
Once your artillery team lands, move them southwest of your repair bay, and attach them to the sensor tower. Go ahead and load up some more combat units if desired for transport.
Eventually, we are going to move our MBG due north into the enemy base, but we have to remove some of it's defenses first. Specifically, do NOT go charging into that bottleneck until at LEAST the circled lancer towers are down; but if you want to wait for even more damage to that base first, go for it (you can use your MBG to hold off the enemy bunker-buster tanks, or the possibly-approaching-from-the-east-now tank group). There is an enemy repair bay, guarded by NO structures, to the far SE corner of the map; if your MBG gets bored due to having nothing to fight, you can send it after this if desired while waiting for your artillery barrage to open up the central base.
Notice how you haven't been hit by VTOLs yet? Nice, isn't it?
Run your tanks through the central base when you think it's been destroyed enough. There will be a few enemy units north of this base that will come defend it, but due to the layout of the base, either they won't be able to get in to do so, or so much of the base is gone it won't matter. It's not a whole lot of them anyway. (If you want to "avoid bottleneck retreats", then you can either use the good 'ol push-and-retreat tactic, or approach the base from the SE, and then let your retreating tanks take the S passage to your repair bay without interference.)
With the central plateau in your hands, move your trucks to it to make a (much less cluttered) base, and when defenses are set up, bring your Artillery team in too.
A good central-plateau setup looks like this:
Yes, I have a couple AA pits at the NE side of this. They may or may not get used, but better safe than sorry.

