I'm sure you can still get away using a AC-14 with great results. Go ahead and compare (a/b) using your existing ac-14 to a stock power cable on the plasma.
It's not like the ac-14 is too small to handle to the load, it's just that the AC-9 can handle anything you hook it up to, it's designed for heavy duty items and it's cheap but the thing is ghastly & large.
They have a 30 day test period refund through AA.