Is it the RX-451 (with the mostly brown sticker) or the RX-451R (mostly black sticker) receiver you have? If it's an R and you have the transmitter set in high response mode that can make servo's get a bit confused if they're not compatible with SSHR.
What happens if you swap the servo and ESC plugs in the receiver? It might be a faulty/worn pot in the transmitter on the steering stick. If the ESC starts jittering about after you've swapped the plugs over I'd guess at it being the pot.
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