LIM_ROLL_CD in Auto mode too small

I have a desire to set my bank radius plane to 36 meter, i see some formula to calculate that

tan teta = (v^2) / (11.26*r)
with teta in degree, v in knot, and r in feet.

after some calculation, i got teta 32.5892799 degree. But even i set LIM_ROLL_CD to 6000 degree i think the actual roll is still to small…

can you help me achieve the bank radius 36 meter? thanks…

v = 15m/s