Wow. I don't use "poop boards" and have zero problems. How many chickens do you have? Chickens are inventive and will figure out how to get up there. Shouldn't be a problem at all when they are little which will give you time to adjust the space. They will probably walk around on the boards, though. They may not be able to get too the roosts for the first week or two.
I use deep litter and, before you dismiss me outright, let me elaborate... I sprinkle scratch on the floor every night, and then give the girls an hour of so after daylight the next morning to scratch around before I let them out for the day. They almost always "make their beds and pull up the covers" nicely, ie their scratching covers and mixes most of the poop. I scrape out the straw under the roost every month or more often in the winter when they are "cooped up" and spend more time on the roost. I scrape it out from under, fork it into the rest of the straw to loosen it up to dry, and then spread dry (but not necessarily clean) straw underneath. It all composts nicely. I add clean straw on top when they have shredded and stomped down the existing straw. They love it. Sprinkle some scratch on the clean, loose straw and they are in chicken heaven. Works wonders in the winter to beat the cabin fever henpecking going on.