This isn't completely my idea. I overheard somebody mention something similar on IRC.
After all ships have fired and asteroids are captured but before finalising the battle report, what if incidental damage is applied to all ships that have been frozen. This can be applied on a random amount basis of about 5-20%.
eg. 1000 co was frozen battle report shows that of those 1000 co 170 were killed. 1000 fr were frozen and 80 of them were killed. and so on.
These results can not be accurately calced and so would add risk to attacking caths. You will lose ships but you won't know if you lose 5% or up to 20% until after you land
In round 25 people were attacking Caths thinking they'll take a punt as they aren't likely to lose any ships anyway.
All Cath needs to be fixed is to add an element of risk and reduce (slightly) the firing power of EMP.
PS. I enjoyed defending PK last round. He was a salvage magnet