Callus control is actually super important for polers!!
I used to be worried that if I removed my calluses, then it would hurt more to pole again, but that's totally not the case!
When you let your calluses get big, it's actually increasing the risk of having them rip, just like Pole Dreamer said in her original post.
Aerial Amy schooled me on this topic when she caught a glimpse of my massive calluses haha
What I do now is exactly what she told me to do, and it works great!
In the shower (near the end of my shower, when the skin has had a bit of chance to soften), I use one of those files like you would have for your feet (I'll attach an example image below) on the calluses on my hands. At first, I was worried that it would hurt the normal skin around my calluses, but the skin on your palms is pretty thick, so it doesn't bother me at all.
Then before bed, I use a thick moisturizer directly on the calluses. Currently, I'm using a "bag balm" - thick ointment almost similar to vaseline in appearance. But Amy had another product that she said rock climbers use a lot.... If I can find out what it's called, then I'll try to post a link for it.
If you're concerned about moisturizer affecting your grip (like I was), then rest assured that it doesn't seem to cause any problems if you do it right before bed. The stuff I use is seriously thick (and greasy), but by the time morning rolls around, it's like it wasn't even there. And I am a person who has STRUGGLED with sweaty hands and difficulty gripping because of medication I take that makes my hands sweat.
Doing this callus care routine has helped SO MUCH!! It didn't negatively affect my grip in any way, if anything, it's better than before! I never had problems with my calluses ripping, but they would get so big that they were very painful sometimes, and that interfered with my grip! I used to resort to clipping with nail clippers, but sometimes you can clip a bit too much and nail clippers are not exactly clean! So you are risking a nasty infection... yuck!
Hope this helps :)