you could slip a spacer in there to get a little bump, if you could find a spacer to fit the tophat. Its not the same shape as the top of OEM strut.
You also can crank the coil down a little bit beyond 1.5", issues arise when you've cranked it to less than the compressed length of the coil, then when it bottoms, the spring compresses on itself and crushes itself.

But, the correct way to achieve proper ride height is to suspend the vehicle with the proper spring. You need to up up your rate to a 650 or 700# spring. Easy to do, and then you did it right. It'll ride much better than a cranked down over compressed lightweight spring