Arrow Vulcan hits 9x yeah?
9x(5000 damage) = 45000
45000 x (Spam of 4) = 180,000 Damage (Without these new weapons)
No Idea how Dexterity works on clowns so lets say 20 dex = 50 damage (Probably Higher but meh)
9x(5550 damage) = 49950
49950 x (Spam of 4) = 199800 Damage (With the new weapons)
An extra 19800 damage isn't too bad in my opinion, but seeing as many clowns/gypsys hit higher than 5k per AV tick, Dexterity probably has a much higher influence on damage compared to my estimate and the Spam of Arrow Vulcan with kiels can sometimes be 5-6 ranging from player to player. These weapons could make clowns and gypsys much more overpowering, especially as a good clown/gypsy can be difficult to beat without these added improvements.
I do agree that they need a new valkyrie weapon though, as AV i'd say is the main damage-output skill and the Soaring Bird prevents the use of it, and gives no 'buffs' towards it.