Currently running R75 rwa with 145 in'(wheels out) on the front & 131 in' on rears(3 holes showing on stub axle). is this setting acceptable or should i have the rears at 144' (6 holes showing).i do quiet a bit of high speed harvesting, up to 17km/per hr in lighter crops & also some hilly country. is there any advantage at 144' or is 131' OK.This was the previous owners setting. just wondering if 144 would be more stable?