I just augmented my last post, so there's new info.
I direct mounted mine, as well, but I used threaded inserts, so I could adjust height. Still, you should be able to adjust yours by layering some dense foam (may take more than you'd expect) beneath the pickup and using longer screws. If you have no intention of raising your pickups, I'd go with ITs and call it a day. I've not played them, but Telerocker has been dead on in his descriptions in my experience. What you will have is a very versatile guitar with a more modern and fat edge (with the ability to roll back the volume for less output).
In my opinion, the Crawler should be paired with hotter single coils, while humbuckers like the Abraxas and "below" should be paired with other low output models. I think the root cause of the confusion is the earlier mislabeling or miscategorization of the Crawler as a Vintage Hot component, when it clearly belongs amongst its hotter, Contemporary brethren.
If you are looking for a guitar that can do dead-to-nuts vintage tones through modern rock, the Abraxas/63 or MM will take you there. Along that spectrum, the Crawler/ITs will pick up somewhere right of center and take you beyond that. That Crawler is a flamethrower lol - and one helluva fun ride. I'm glad I've got it in another axe. It will have it's time. Coincidentally, there's a 63 in the neck of that one - just needs to be restrung, since I just swapped the Crawler into it. I haven't installed the MM yet, so I'll restring her and see how it plays with the 63. Could be magical, but I suspect my estimations are correct.