I've been reading Starting Strength 2n Edition: Basic Barbell Training since last summer, including the awesome book about training plannings, Practical Programming and I've been following Mark Rippetoe's very own Starting Strength site ever since then. Lots and lots of useful infos to be gained there! Now, I'm following the program since two weeks.
While I don't lift anywhere close to the weight you're handling, I've certainly learned a few things, since I got in touch with SS, especially about recovery.
The thing is, when one is in the novice phase (meaning, the body adapts fast, between 48 to 72 hours, which is enough time to allow an increase of workload in the next workout), you need to do some active recovery, if you want to be able handle the continually increased workload.
Those Workouts A + B, which you mentioned, are meant to stimulate the most rapid growth in strength for a novice. It's not self-sustaining, however. For this model to work the novice needs to do everything he can to ensure, that he is getting enough sleep, protein and calories (and obviously vitamins and the like). Then he will recover just about enough to make through the next workout.
It's quite possible, you're not doing enough active recovery to get ready in time for the next workout, namely the squat. It's not exactly a bad thing, it just means, you will need longer to get the most out of the Novice's ability to adapt fast, and you won't be able to put additional weight every other workout, but maybe only every second or third workout.
There's something else to consider: If you've nearly exhausted your ability to adapt for a higher workload between every workout, you might be close in approaching Intermediate level (which now can handle so much workload, that the recovery time needed to adapt now exceeds the time between two workouts).
Either way, 48 hours is enough time for recovery, if you do most things right (like eating lots and lots and sleep good and thorough) AND if you're still in the Novice phase. AND if you don't do silly, exhausting stuff in between. Then I would keep my schedule. If you don't do everything right, you should consider adding weights maybe every 2nd workout or so, to account for the slower rate of strength growth in your body.
And just to make sure, everyone understands it right: the term "Novice" DOES NOT stand for how much or how long you've been lifting weights. It stands for the ability to adapt fast enough to be able to handle higher weights after 48-72 hours - meaning, getting stronger within this timeframe.
It's also the same for pretty much everyone, from the big young lad to an old lady, since it (the adaption I talked about) is a fundamental biological mechanism of the human body. Of course, the capability to handle weights differs for everyone.