As Ive been having that hard a time with conventional OKW strats, Ive been getting more desperate.
To make up for the woeful lack of AI early on, Ive started doing a T2 opening. Early kubel with S pio to harras their early capping. Volks cap.
Convert muni to fuel (probably for whole game) Get early Flak HT, use it to hold a good half of the map. Ive been doing ok with it, just position it kinda like you would a Flak HQ, i.e. use shot blockers to protect it, but where it will cut flanking rifles to shreds. Always reposition it to prevent enemy from ambushing it. Once you have smoke unlocked, be ready at all times to hit its control group and hit smoke, as an AT gun will kill it so fast (2 shots).
When you get your second truck, back teck immediatley to T1 for medics (usually just in my base, unless large map).
Go Scavenge doctrine and pop JLI into buildings near engagements to help you swing it in your favor. Also use them to harass enemy fuel (I also need to remember to use booby-trap points more). But if they send many squads, just retreat, rather than have them wiped.
As soon as you get 8 CP, call an Ostwind, yes thats before building T3 (flak HQ).. this allows you to be more mobile and more aggressive !!!
This build is fighting fire with fire (allied aggresion, with your own aggresive anti inf build).
For AT, you want a combination of good mines, shreks and rakketens, all must be used well. With munis being converted, I use the shrek price bulletins and save nearly all muni for shreks, after maybe 2-4 mines.
You are relying on bleeding them so much and crippling their map control, that they wont field too many vehicles in a hurry. If you keep the flak HT alive when you get a Ostwind, it gets brutal.
If the game is going your way, you will have fuel flooding in, and now its not a big deal to build T3, which you can afford a lot more aggressive placement with than normally, as your map control is way better.
Alternatively, if amour is troubling you, you might just grab a JP4 instead of T3. But its fairly essential that your shreks and rakketens at the very least keep your Ostwind (and hopefully flak HT alive).
Sometimes this can crush allies.. sometimes it might not work, depends if you can dominate, but at least it puts the ball in our court, rather than being at the mercy of wave after wave of rifles.
It does take a lot of practice though, as mistakes with the vehicles is GG.
Also, this goes for the kubel with any strat, really try to keep it alive, then after a while when things get dicey for the kubel to continue fighting, pull it back and stick it behind a shot blocker, and switch on its detection thing, voila, free scouting/detection

Its a free toggle ability, so you can just forget about it and it will alert you to some of the enemys movements.