I currently have a VA-5 head and two 70A plates and am looking for a smaller plate for my outdoorsmans bino mount (fits better in bino harness). I've tried the cheapy arca plates on amazon and the sirui TY-C10 plate. Both of them do not index the same as they have a less deep v-notch than the 70A. Has anyone found a smaller plate that indexes the same as the 70A? Did I just get an off tolerance C10?