My last bottle calf sounds at lot like yours. I had to give it a couple of shots of A and D a week apart and a shot of Selenium before it walked without stiffness. I could even hear the joints creaking. So far she's been sound since this.
The gal that runs the horse stable at our place a few years back had a holstein cow with four drop calves plus her own and she still had to be milked out some days. I had never seen a cow produce so much milk, all the calves were fat and happy, mostly beef breeds.