Your fuel economy should be a lot better than that (on a 22 footer??) IMO. Maybe as much as 2x better.
I am going to make some comments that I hope you will take as helpfull observations.
From the pictures of the underside of your bow it would appear that there are some large dents on the port side that will catch a lot of water. These spoons need to be pushed or pulled out to recreate low drag planning surfaces.
Baja runners are also rough in a head sea chop, so if you are trimming down the bow to compensate this will drastically cut your mileage in any hull and place the bow dents into the water will afftect you even more, like a plow or a brake. You might also consider a fine sand and sealer if her old bottom is getting rougher than slippery.
To run more in a trimmed up position to get more speed at the same rpm consider adding some lenco trim tabs to extend your footprint and get a pair of spring-shock absorber seat to soften the ride. These go for about $110 each.
http://www.tractorpartsinc.com/universa ... 11_ctg.htm
I would guess that weight and motor height and perhaps a different prop might help.
Please consider a membership to sea tow in San Diego so that you can lose the kicker and all the extra gas you are carrying. Plus the boat will ride nice and level without the kicker on one side.
Cut your gear weight down to the essential, especially in the forward cabin. You may be running the motor at an extreme uneffecient angler to trim up if there is too much weight forward, and cabins allways collect more "essential items" over time. So here we are talking toal weight and how you have her balanced with that weight.
Use wet burlap bags instead of a lot of ice to cool your fish, and only put up the forward eisenglass windshield when you need it. The side panels shouldn't affect your speed near as much as the front one.
Blast me if I am wrong, I'm real thick skinned.
BTW, I really like your rig.