I have used these fighter bombers with very similar stats some months ago and they struck me as alright. Admittedly I was playing against an Imperial guard army and the weapons are ideal to kill mechanised troops. With better firepower than thunderbolts (my eternal benchmark), the ability to intercept if needs dictate (with a 30cm AA3+ shot) with a save twice as good as normal fighters. Certainly I would take them at 200 if I could over thunderbolts

So is it instead why not go for the dedicated bomber instead of the FB, or the fighters instead of the FB?
Fighters to FB the F's have 6xAP4+/AP6+ vs FB's 2bp IC (with the FB's having a stand off attack if needed) AP4+, AT4+. Seems pretty similar.
Somethign that wouldn't affect the points is maybe make the FB forward arc for its lascannon - would account for the range drop and give it a small boost?
Combined with no save for the figthers - That enough to separate them out? Or should the ground attack of the fighters be reduced? Go for a twin weapon? Possible stat lines could be
30cm AP3+/AT5+/AA3+ fixed forward
30cm AP3+/AT5+/AA4+ forward arc
15cm AP3+/AT5+/AA3+ forward arc
15cm AP3+/AT5+/AA4+ 360'
Probably re-cost as well to 150 or so with the above.
Maybe try first though no save for F's and 180' for fb's AA?
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