It's probably me not explaining things properly. Words are difficult
Have some pics. All pics are taken with the ground at 0°, so the way the angles look in the pics are the way they are in real life (hopefully).
This is the bike on it's side stand:
And here's it on the centre stand:
So you see the reservoir is still and an angle, pointing down towards the centre of the bike.
Here's the MC when the bike is on the centre stand, so you can kinda see how the fluid sits in there:
You can also just about see the the MC is set at an angle to the mount and brake lever, so on a flat bar the MC wouldn't be parallel with the bars. Actually, looking at the bars, theyt aren't as flat as I thought. I've got some 758's that I'm going to stick on there soon. Maybe that will make enough of a difference.