Well, like Bradford, take with a grain of salt - I pretty much only troll Salmon on the Columbia River in Oregon and use Scotty socket type (the socket screws onto the inside of top of the gunnel) and they adjust in any direction. If they're strong enough for Tuna, they'd be something to consider. Another possibility would be to mount a couple of not very high stainless rails in the tunnels and get some clamp-on rod holders.
I just looked on marinepartdepot.com and saw some interesting adjustable stainless rod holders that top-mount on the gunnels, they look like they might solve your problem. I've bought stuff from them and it's been pretty good stuff and way less expensive than other suppliers. A couple of items that should have exactly matched had a different screw pattern and some of their descriptions (measurements) are a little vague but they've been good about taking the few things back that weren't what I wanted.
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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