Consequence of too much tip weight: your plane looks awkward in the maneuvers, particularly the square corners.
Consequence of too little tip weight: your plane is a splintered wreck, and you have pulled muscles from running away to save the plane, or yourself.
Does it roll in on the 2nd or 3rd corner of the wingover? The 4th? Have you done any other square maneuvers? How does it fly at 45 degrees upright? Inverted? How does it do in the round manuevers, and inside compared to outside?
If it tends to go light on the lines every time you do a corner, then you have too little tip weight, or the leadouts are really in the wrong place, or the outside flap is considerably stiffer than the inside. If the problem isn't obvious in the shop -- add tip weight, get the problem sorted, and take the tip weight out.
If it tends to go light on the insides and not the outsides, then you have a warp. Either your flaps (or wing) are tweaked, and it's always rolled counter-clockwise as seen from the back, or your tail is tweaked, with the stab not level to the wings. You should be able to put the spinner on the toe of your shoe and sight down the back of the airplane -- the stab should be perfectly parallel to the wings. If it's rotated, fix it -- probably by cutting underneath the tail and compressing that side.