I'd like to see blade generation have a replacement effect when at max blades so that the signet of ether can continue to trigger when all your bladesongs are on cd. Additionally this would allow you to save f3-4 for when their needed instead of using them purely so you can keep generating new blades for sustain.
I agree that Virtuoso needs a little something extra whether thats party buffs or utility/ defenses however I do enjoy the class theme of creating phantasmal blades and adopting this sort of active sustain you get from blade generation (for condition Virtuoso atleast, i've not tried power)