It is very critical on servo horn placement - especially if you are using a low profile servo but it is possible to achieve full lock.
I too have to mount the horn slightly offset toward the centreline of the car with my low profile servo and then I also have to run at 150% EPA on my Spektrum Tx.
Curiously I can turn the EPA down to 135% when I swap to the 4mm trailing axles and given that they yield a smoother steering response, you might find it beneficial to try these also.
HTH
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