1: simply revert to it's old range so matches panther
3: price decrease to 400mp 155f, popcap down to 17. (probably the worst of the three options here imo, cheap doesnt exactly mean good either with how old t34/76 was)
Both of these changes at once would probably be most appropriate. The reductions in cost alone drifts the cost effectiveness of the unit far more in UKF's favor. Even if it continues to fail to trade with Panther's directly, it would be a much more powerful counter to Ostheer T3 and OKW's P4. This is the exact role that lategame allied tech decisions should be: forcing Axis to spend their fuel reserves to stay competitive.
The reduction of range on the Comet only made sense in the context of Comets fighting Panthers in a vacuum.
The Comet's anti-infantry capabilities should likely be made more reliable, indeed, but I hesitate to think it should be outright improved. If that makes any sense. I mean like a more accurate and larger AoE shell with a tighter lethal radius.
I think, in a sense, the Comet is sort of the British T34/85 to the Cromwell as the T34/76. Performance between the units should probably correlate in a similar fashion.