Churchill see little action and imo increasing the utility of the vehicle might help it become more attractive.
1) Move gun smoke/WP smoke from Comet to Churchill. Comet is already very strong and imo it does not need the smoke. In addition WP smoke (could even become vet 0 with a reduction in range to 40) could serve Churchill allot in dealing with HMG/ATG.
2) Make "Infantry Support Smoke" provide cover status to infantry so that infantry supporting the Churchill can fight without penalties.
3) Allow Tank commander upgrade for Churchill (reducing the detect invisible radius)
On tablet, keeping short and praying to formatting gods.
Compared to Ost smoke plane, it comes at a mere 1cp, pops much faster and is used against a faction that's reliant on team weapons. It's a way to outright ignore good MG placement and removes much of the risk of blobbing Ostheer.
Solution is simple, mirror to Ost smoke plane. Easy fix.