I also have some click-induced hearing loss.
Partly through using the Shure 215's and partly through using some custom in-ear moulded IEM's that had a poor mould. Partly through just playing the drums too loud.
I have a new set of custom IEM, this time with a great mould, and the isolation is much better, I can turn the click down.
As Bermuda said before, the mould/fit/isolation is the key here.
Personally, for me, 'universal' monitors such as the Shure ones never gave me a complete seal, so I get a lot of drums leaking through, and thus me turning up the click, just as in your own situation. I tried all different types of tips.
Ergonomics and 'universal' products will fail a percentage of the population. We aren't all 'average', that's why we call it an average.
My suggestion is to get some custom moulded IEM's and make sure that the seal is perfect. The seal can break when you move your jaw, as this changes the shape of your inner ear. Keep this in mind.
The other (probably most important thing) I have learned, is that we don't need to play so loud. I play rock and metal and it is part of the style usually to be a bit of a neanderthal drummer, playing loud, all the time. I certainly adhered to that for a while until last year. For many years I did not want to compromise on volume as I thought it was integral to the music. Certainly, a few professional metal drummers have not, and now they have hearing loss (Vinnie Paul, ryan van poederooyen, to name a few).
And it's not just that, you need to learn to 'play to the room' as they say. Not just from the perspective of an audience, but definitely from the view of your ear health. My band currently practices in a 14 foot square room with no sound dampening on the wall, two guitar stacks, a bass stack, PA and drum kit. All of that sound energy has nowhere to go and I can come away from two hours in there with ringing in my ears after STILL WEARING earplugs the whole time. It's crazy.
So to summarise, look at your surroundings and play accordingly, and don't be afraid to 'turn' yourself down. As I said, my stupid 'metal pride' (probably the same metal pride that means my bandmates don't wear any form of hearing protection at all!) meant that I refused to do this. And many records have been cut with low volume drums. And, we have microphones to amplify us live (hopefully)
The bottom line; if we play quieter, we can turn the click down and protect our hearing.
Good luck,
Andy