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I do have a spektrum And I udjusted the steering to get more but didnt do anything.You might measure you're Servo arm and get an adjustable arm
https://www.integy.com/st_main.html?p_catid=311
check here and find one that fits your project.
longer arm means more steering
or you can take the more expensive route and upgrade your transmitter then you could turn up servo end points on radio