RE: Skymaster F-15 Steering Stabilty
Might be your expo? What is your steering expo set at? I use -75 for my low rates. And -4 to -45 for high. (high rate is used when I turn around on the runway) Then I switch to low rates. The steering should barely move when taking off! What radio are you using? The expo is I believe, switched on JR and Futaba. I use Futaba and to get LESS sensitivity, I use - On JR I believe its + for less sensitivity. Hope that helps.
Mario