There's quite a debate about this, one argument is that the kits development is mostly controlled by the resources the does placenta can deliver, and therefore the sires size doesn't matter much then and comes into play when the kits grow up.
Can't remember having ever read of actual problems caused by a bigger buck, but that very well may be because not many would write about a bad outcome or because few would do this on purpose because there is the other theory. Which assumes that big father -> big kits.
Personally, I tend to favour the first viewpoint, at least as long the pairing isn't too extreme. Like, when genes actually are limiting growth like in dwarfs, making a doe way smaller than her breed size would be. Also, big breeds aren't really growing so much faster, but longer, most meat breeds imo tend to be medium sized for this reason. I can't recall that a baby/father size correlation exists in humans either.
Since your doe is a fair size I wouldn't expect much problems, but having a vet have a look might really be a good idea. Please keep us updated how this turns out.
