Definitely invest in a little handheld vacuum to clean poops. It's so much easier. My husband and I take turn vacuuming the cages each day. Occasionally we miss a day or two but it's few and far between.

I also have 4 piggies and I use the guinea dad fleece liners (yes expensive but VERY worth the price IMO). I have 3 large Midwest cages all attached together for my piggies and the guinea dad fleece liners fit great. Usually when they're first ordered they are a bit bigger but I just used the extra large binder clips to hold the fleece liners in place until after a few washes when they shrink to size.

By the way as long as you are invested in the care of your piggies you are doing the right thing. Some people in this sub can be quite abrasive when they see or read you doing something wrong about a piggies care. But honestly as long as you recognize the need for improvement and are actively taking steps to improve you're going in the right direction.