For reference, I do not have experience with whether or not the Pitlocks work with horizontal dropouts, but I've known the Pinheads to provide marginal to poor performance with them, despite their being advertised for use with horizontal dropouts. I have now had 2 experiences with users of them coming into the shop after their Pinhead let the rear wheel turn in the frame and rub the left chainstay. These users were having consistent problems in this regard. They were correctly installed and tightened in both cases.

Contrastingly, i've personally used them with no issue, not even with them rusting, but have never used them on horizontal dropouts.

I think that in your case, you may be happier with the Pitlock skewers. They are of better quality overall.