Maybe they could be changed to do a certain percentage of their damage as hard flux, perhaps more the closer you are.
The HIL is notable for essentially forcing the target to keep its shields up, other beams don't do that so well since you can tank something like a battery of tac lasers on your armor with barely a scratch and gravitons of course don't do much there either. So HIL ensures that the target won't drop its shields for a kinetic damage burst. If other beams had a similar "damage to armor/hull but useless against shields" nature they'd be able to do the same, serve to keep the shields targetable for your kinetic volleys.
I can understand tac lasers being pretty weak, they're small weapons with 1000 range with a low OP cost after all. They're upgraded PD lasers for people who use the PDAI hull mod. Gravitons seem more designed around giving you something with negligible flux drain you can throw into medium slots but they're coming across more as decorative than useful these days, especially with all the defensive bonuses ships have from skills now. The most you can see them doing is when some Hound flies near them for a minute and you can sloooooooooowly see its health go down. Even whole batteries of graviton beams won't make anyone care since you pretty much need multiple ships focusing their gravitons on a single target to make it really notice.