Re the imbalance, hard to say just from those few pics, but if he always stands a bit 'camped under' in front like that, extra pressure on the toes will make them more prone to flaring. Also it appears he is turned out, in the left fore - as it's from the elbow/shoulder, some good bodywork *might* fix that.
Re the feed, yes, food & *nutrition* has a big impact on hooves. But it will have nothing to do with your horse's apparent hoof growth. Firstly, regardless of what it is, how much etc, it's not going to make any noticable difference at all in the feet after only a few weeks. Secondly, I really suspect it's not about 'fast growth', but they were left 'too long' - this is not just 5 week's growth from a perfect foot - as mentioned, not judging your farrier on it, but perhaps he didn't exfoliate but trimmed only to the existing sole level, which fell out soon after, or some such.