Hank and Sunny are currently the most powerful supports due to the their defensive utility and the variety of tools they bring to a team.
For reasons outlined below I do not think that Cabot can compete with them.
To this end I propose a short list of buff options to bring him up to par.
Hank comes with a reliable shield to deploy as needed and his Orbital Barrage to force a Monster to leave a location.
He forces the Monster to change its game plan to focus Hank or deal with the shield and Orbital Barrage as a secondary protective measure.
Sunny has a shield drone that can somewhat less reliably defend teammates like Hank.
Her Jetpack Beam on the other hand is an extremely reliable and effective tool for helping teammates escape with many other potential uses.
Both Sunny and Hank are capable of dealing respectable damage with their weapons as well.
Cabot and Bucket are far more specialized in fights than Hank and Sunny.
Though they both come with tools to help find the Monster, their combat is entirely damage focused aside the cloak that all Supports share.
Bucket is focused on defensive damage and area denial via his Sentry Guns.
Cabot is focused on offensive damage via his Damage Amp and his formerly exceptional Rail Gun.
For either of these damage-focused supports to compete with Hank and Sunny’s utility they either need more utility of their own or very powerful damage tools to compensate.
Cabot’s tools to fill his damage niche are the Rail Gun and the Damage Amp.
By virtue of Support damage being second only to the Assault, the Damage Amp is only truly useful when the Assault is performing their ideal damage case.
This makes it a very flashy tool to help Assaults punish aggressive Monsters, but leaves it mostly useless against evasive Monsters that Assaults struggle with.
Formerly, Cabot’s Rail Gun was known for exceptional DPS among Support weaponry.
It fills the niche where the Damage Amp is ineffective: providing consistent damage against hard to hit targets when the Assault is not in position.
Nowadays, it is more or less a run of the mill Support weapon, leaving Cabot’s Damage Amp to compete with Hank and Sunny’s utility skills alone.
In my opinion, it doesn’t even come close to the usefulness of their utility.
For this reason I propose giving Cabot some of his previous power back, or giving him more utility to be less of an ineffectual specialist.
A. Undo the 30% damage nerf on the Rail Gun. Keep the 25% reload time nerf.
Gives Cabot a good deal of his consistent damage back and strengthens him in his specialized role, while keeping him weaker than he once was.
B. Buff the Damage Amp to charge Cabot’s Cloak when it amplifies damage.
This would give him more cloak uptime and a faster recharge while playing nicely into his existing kit. To gain this charge he would need to expose himself in firing the weapon, making it largely a tool to keep teammates safe.
C. Extend Cabot’s Cloak range.
An alternate, if blander option that would make it easier for Cabot to cloak teammates, helping him compete with the defensive capabilities of other Hunters.
D. Increase the Damage Amp multiplier to 3X. From FrontlinerDelta
Assuming nothing else changed it would effectively empty sooner, dealing the charge’s worth of damage faster.
This would make it worth emptying whenever it was charged, rather than only worth it when the Assault is in position.
E. Allow the Railgun to create 2X Weakpoints. From Applecrow
This would create a strong synergy between the Railgun and the Damage Amp and lessen the importance of the Assault being in position.
It would create a cycle of applying weakpoints and amping damage, strongly encouraging teammates to fire on the weakpoints during the Damage Amp.