C&C Messy Loft

We adopted 3 males that are 2.5 months old and they have been living in a C&C cage for about 3 weeks now. They are spending about 49% of their time in the loft and 49% of their time in the kitchen under the loft. In the kitchen we are using disposable bedding and in the loft we are using a fleece flipper. Even vacuuming the loft twice a day we are finding piles and piles of poo up there. I feel like I need to change the fleece ever other day. I tried disposable bedding in the loft but it made a huge mess and was a pain to clean.

I took the ramp away tonight hoping it will force them to explore the other half of the cage they aren't using. We have a chew stick and water on the other end to encourage them to go down there, but after a week they still aren't interested. Any suggestions on what to do to encourage them to use the rest of their cage? I'm also open for suggestions on what to do with the loft. It is the 1x2 loft.

Thanks!