I typically use Ace servos which are generally considered power hogs, so I would guess it probably pulls some decent amps. I'll try the cap first and go from there.

I have an MMP in my Xray T2 and so far with a Hitec 6965HB (think thats whats in there), its performing flawlessly, althought that servo and car doesnt put anywhere near the load on the bec that the ace in an 1/8 scale would.