Cheers to that... I'm afraid that I'll save you the trouble of PM'ing me, and tell you personally that I can't help, though.
I haven't fitted a scope yet, and when I do, it's going to be on a different handle- I'm replacing it with a G36 one.
I've noticed that problem too, that the rounds actually end up furthur down in the target then where I aimed, because of the insanely high mount. Anyways, I'm sure that many sights can be adjusted for declination, I know this for a fact- yet for brand names and individual models, I'm afraid I couldn't help you.
However, to tilt the scope- on the rail, I believe that by dremelling off part of the bottom, and tilting the rail downwards, you should be able to tilt your scope/sight downwards, if that's what you wanted. The rail is only bolted onto a hole on the left side, and simply sits there- if you take off part of the bottom, it shouldn't be too hard.
Cheers, good luck.