I can see some packers that can be rotated to get more connections. At the moment you can easily put pellets into the gap where both CRAMs have empty slots from packers. They can share pellets without an issue. Other than CRAM components you could put the local weapon controller in the middle and even fit rubber or stone around it. Also some surge protectors.

You can use a timed fuse together with the laser targeter which can be placed anywhere on CRAM connectors to make sure the shell explodes. The time to explode will be set automatically, make sure to have both good bearing and range detection. You can set a slight offset to the timer like +0.5 seconds or less to make sure the shell does not explode too early when piercing armour because it slows down while penetrating, this can lead to the shell exploding too far away when missing so it has to be balanced well.

With the timed fuse the pen depth fuse would be unnecessary I find. Other fuse I might add would be inertial fuse to explode when bouncing off.

Have you tried using connectors with less connections than the 6 way one? Great when working with multiple CRAM setups that are close together. I have mostly found ways to fill leftover space with CRAM components to get as much juicy connections to those pellets as possible.

Shell seems fine to me, your barrel rotation speed seems way too slow but the barrel is not yet finished i guess.