Any good techniques for clamping the tabs?
Try and squeegee out as much epoxy as possible before trying to clamp the tabs. To get the tabs straight and parallel with no twist or incline, use two long boards to clamp the tabs and use gage (spacer) blocks between the boards. Do not use too much clamping force. 45 layers of fiberglass is like walking on greased ball bearings. Too much pressure will cause the layers to slide around, buckle, and separate, causing the tabs to be uneven after cure. In the worst case, too much pressure also causes a crease in the tab that can lead to localized stress areas and potential delamination.
