Issue wearing my devices *itchy*! Help!

I love that we discovered chastity! The missus is slowly getting 'into the act' so to speak and life couldn't be much greater!

We do have a range of devices accumulated over the past months, the best-fitting one of which is this one:

https://www.amazon.com/Master-Delux...075J359QW/ref=cm_cr_arp_d_product_top?ie=UTF8

I use the largest ring, which I believe is the 50mm one.

I do have an issue wearing the devices that I'm hoping to get some help with here. I'm intact (uncircumsized) and I'm not rolling up my foreskin all the way when caged. All seems fine when I just put the cage on, but a couple of hours in, I start getting *itches* to my skin, mostly around where my foreskin is all *bunched* up, but also at the scrotum area.

I've tried solving the scrotum area issue by applying more generous amounts of silicon lube (seems to work great, until I take a shower and it gets washed off, then I simply reapply it), but I can't seem to solve the issue with the, uh, *top*. It is hard to function wearing the cage for an extended time, when I start itching and have to *scratch* which obviously does not look too nice! There is no skin irritation that I can see, just minor *itches* that simply require me to scratch, then it goes away for a while - mind-boggling!

On the few occasions I've managed to last 2-3 days without removing my cage, the sensation is absolutely insane and I just wish I could keep it on longer!

Other than this issue I'm definitely enjoying the chastity kink and I'm looking forward to any tips anyone here might have to resolve my rather peculiar issue! TIA!