If everything is Kosher as far as you can tell, one way to ease the tightness of the wedge is either to reduce it's width or increase the length of the slot. Look hard at the cylinder pin slot and the edge of the wedge where they meet. If there are no burrs there you can file either the edge of the wedge, or the thin face of the slot where the wedge's edge bears against it. One or two thousandths will allow the wedge to go in much further. GO EASY here as catastrophe, (That miserable Greek SOB) awaits. Most times, there's something in that slot which has no business being there and it's eviction will solve the problem. If you decide to use a file, purify yourself in the smoke of the holy sweetgrass, sacrifice an elected democrat, preferably slowly, then go ahead with judicious reluctance. One careful file stroke, test fit, another file stroke, test fit. Rinse and repeat.
Three Hawks