Hi again guys, ok Tamiya servo horn sorted the problem right out.
Steering is sharp and precise now (although it is DAMN twitchy and fast)
So much so, that I binned it into a kerb, ...... and the only damage?
The servo horn broke. ARGH!!!
BUt at least I have diagnosed the problem.
Im assuming I can buy replacement parts like a servo horn for the Savox 1258G? Never had to buy bits of a servo before.
Thanks a huge amont to everyone - it was really useful to just "talk" it through.