I agree that utility skills should have their potencies removed and added to other skills to compensate.

Flaming Arrow would be a bit more tricky, though what I'd suggest is turning it into a buff that causes the next shot to place a flaming patch at the target's feet. The skill is there only to do damage (doesn't snare or incapacitate targets like Shadow Flare), unless being able to use it prior to pulls is tat important.

I like the idea of Bloodletter stacking on procs. An additional way to handle this would be to tret it like how procs work with normal casters where said procs reduce or remove cast times. Of course, the very nature of BL procs would have to change for that to work.