Mini Vs seem to have great reviews all round - with the only issue seeming to be mud clearance. After my last cyclocross race, I'm going to be building up a singlespeed for really muddy races next year (quite fancy an on one disc braked machine - it just makes sense!) , so lack of mud clearance on this bike isn't much of an issue.
They have got to be better than these kore sport calipers I am running at the moment - I've tried all sorts of adjustment, increasing and decreasing the mechanical advantage etc, with no joy
I am sorry Montage but if you had told me they are Kore Sport (like pic below in profile?) I would have been able to tell you that adjustment is pointless... I am afraid it has the profile I said won't work in my earlier post above.
You see they have nearly the same profile as the Wide profile canti (the blue one) in the calculator
here. As you can see by adjusting the yoke (you can move the Y up and down with your cursor on screen) it makes zero difference to MA (mechanical advantage), because the curve is flat for pretty much any yoke height till it hits the tyre, it is because the design is such that point A (the cable attachment) is below/level to point R (the pad).
You MIGHT be able to change its characteristic marginally, IF the objective is to increase MA, by setting the pads as close to the calipers as possible (by swapping spacers or quit using any, or using thinner pads), kind of like trying to turn it into a medium profile canti. But these are last ditch fettling and might do more harm than good (like pad not hitting square on the rim, or metal pad holder digging into the rim etc.). Canti's if properly set up with suitable levers are no less powerful than any rim brake- it is the same physics.
Mini-Vs will give you a whole new set of problems as you said, and disc can mean new wheels if not new forks - but of course YMMV.
Hope it helps.