Agreed, an increased wheel base would indeed have an effect, but that would be minimal and visible only after several thousand kilometers have been clocked in new configuration. I am just looking for switching to 3.00 from 2.75. That's not a big increase. The width of tyre in contact with ground might increase by half an inch or so. What do you think?
PS: Where did you do A-Levels from, and when? I did from Crescent, 2004 - 2006. In our times, we did have circular motion in Physics' syllabus, but not rotational motion (motion about an object's own axis).
Stable though it is, but it looks empty-ish from behind with the stock 2.75 tyre. It would look better with a 3.00 tyre, and would add to its stability at high speed and sudden braking with the immediate downside effect of increased fuel consumption on an already fuel-thirsty machine.