Not that my boat is anything like an O'day, I still ran into the same problems. A couple of things. I moved the bimini back even with the back of the boat. This means the backstay pokes through the bimini. I found a 2 inch thru-hull fitting and glued it to the hole in the bimini, to protect the material around hole from damage. Really not a bad deal. This allowed the bimini to mount back far enough to clear the boom under most conditions. Noticing the one in the earlier photos, I have a 2 rail, instead of the 3 rail, so not as long. My stabilizing posts in the back are vertical, because the bimini is mounted so far back. The bimini is tall, and I even raised it up farther by mounting it on blocks. It's tall enough to look a little weird on the boat, however as it turns out, it is really nice to be able to stand up under the bimini. It makes it much easier to get around - especially crawling over the traveler in the middle of the cockpit.