Interesting little set up. To ME just looking at the frame in the picture, the oar vs seat geometry just does not look right due to how recessed the seat is but maybe I'm not taking into account that the oar towers aren't that high, and you said it works for you (really?) so..... I would never use the fixed oar locks you have, more likely to break an oar or blade that way but for easy stuff they will get the job done. Like you said you have other oar locks. The position of the frame relative to the chafe strips on top of the raft, I would move the frame farther forward towards the bow (I know the pictures may not be indicative of the final position, so correct me if I'm wrong), as far forward as it will go on the chafe pad so your bow-stern weight distribution is at least neutral if not slightly bow heavy for white water performance.
I know, I know, you're sick of hearing it, but I too would prefer to have my seat bars level with the top of the raft. Increased visibility is a big one (every inch counts....), but you're also forgetting another thing - gear. If you move the frame as far forward as it will go on the chafe strip with the present set up to get neutral or slightly bow heavy bias, you won't have much room in front of the leg brace to put gear (if any), and putting crap around your legs or between your legs is a bit of a no-no - you want to give yourself lots of room there. That means with the drop bars most of the gear will have to go behind your seat which could affect being bow-stern weight neutral or slightly bow heavy potentially making you stern heavy which is not desirable. This would be as opposed to underneath your seat where with seat bars level with the tubes you would have much greater space for gear (and potentially a small cooler). With stuff under the seat you can more easily cam strap it to the bottom of your frame below you for easier access if needed instead of having to reach behind you, while you are in the boat. If you ever flipped having it directly below the seat lashed to the frame would be more secure potentially so you do not yard sale as easily. With everything under the seat, this means the space behind the rower is potential leg space for someone sitting on the back of tubes as far as a "get the job done" jump seat (in a pinch anyways) or MORE gear for a multi day trip, if you're so inclined.
If in the future you wanted to alter the frame or use a different frame (perhaps the NRS frame system as it's modular/adjustable as you already know) where you wanted to accomodate a front fly fisher you'd have a front seat bar with seat, front leg brace, then rower seat in the back. With drop bars for the rower you have absolutely no room for gear as the frame will be slightly longer with that arrangement. With rower seat bar even with the top of the tubes or maybe even raised slightly, you have room for gear for you and your front fly fisher (if they could fit on such a boat). And plus you'll want the rear seat height then for easier visibility around your front passenger.
Just some thoughts anyways....
