Flutter?
Nope, but I've never used more hardware than you see in the picture above. Less hardware means less weight. And fewer points where slop can happen. Slop is most often the cause of flutter. Heavier surfaces isn't usually a major cause, but no reason to push the issue.

Smoother way of installing? I like the lighter weight, stronger attachment, and reduction in number of places where slop can happen.

What I really like, after having flown a couple of other modeler's Skybolts that were built as the ARF mfg suggested, is the way mine flies.

Same position as in the instructions? Look at the instructions for where the connecting rod will attach for both bottom and top ailerons. Where is the top attached? Underneath the aileron. Where is the attachment in the picture? Above the top aileron. The attachment here shows the layout for two different riggings. Notice that both show where right angles at each connect point wind up going. The accepted direction is for the right angle to go directly to the hinge line of the surface. When the right angle doesn't, the surface does not move uniformly. It will move less or more than the servo tries to move it. That happens to be how experienced modelers rig to get differential ailerons (where one move appreciably more than the other in one direction and the opposite difference in movement in the other direction). The 2nd picture shows the different amounts the ailerons move on a Skybolt with the OEM rigging. With the rigging shown in that earlier attachment, all 4 ailerons move the exact same amount up or down. With the OEM, when both lowers move 20degrees, one upper moves 23degrees while the other moves 26. That's 3 different aileron deflections at the same time.