A trade ship escorted by two fighters can be dealt with by a gunny, which then with ease takes remaining escorts.
If the snubs strike the convoy, they have or-or - either they rethreat and survive, or kill the transport and then have low chances against it's escorts (which have still full b/b, while raiders don't).
Balance is the problem. Deal with the balance first, and everything will be fine.
By these stupid rules leading team is trying to solve problems in VERY unnatural way.