Michael i know this sounds old school but have you tried putting some weight up front just to see if it is a CG thing . I remember we had to do it in the first tunnel we drag raced until we figured the boat out,ask Rick about the weight box I know that is not a fix but it will at least let you know if weight is what you are dealing with.

Mike I appreciate the suggestion & the answer to your question is YES I brought 140lbs of tungsten the day that Ben & I tested & it just slowed acceleration & didn't help the porpoise at all. It's definitely the added transom weight & no ability to relocate anything else forward from the bilge to offset it nor can the engines be slid forward. All this probably magnified by the fact the boat is only 30' from a leverage standpoint thus the reason ballast was of no help. Sounds good anyway!

I will post a picture when I get back in town after New years.

I think I found it. Is it a TH pedal? It appears I have room for it too. CP makes a nice steering wheel mounted trim switch but as discussed steering wheel is rarely in the same position throughout the day.

Hot Trim™ Foot Trim Control
Floor mounted trim is an excellent safety item in boat performance accessories. Mounts in floor of boat allowing operator to trim engine with foot. Attractive black matte unit comes prewired with wiring instructions to connect it to existing trim wiring.

Part # Description
HT-1 HOT TRIM™ - Foot Trim Control Unit

That's it. Works very well. Your foot rests in it and will not easily come out.

hay mike did you put the weight in front of the dash bulk head

Yes sir, 4- 35lb blocks of tungsten in my bow storage locker approx 2/3 forward of transom (20') & 10' from the bow. Ben said racers bolt steel plates to the bulkheads far forward in the sponsons. That would have been to difficult too secure just for testing purposes.

Dropped NASCAT off to Ben Robertson at BAR Marine in SC today. He's attacking the custom tunnel tab project and a few other things for me.

The pics below are of an MTI but the same principal. Tab will be fabricated out of 1" polyethylene sheet, reusing rams & pump from trim tabs, brackets, hoses & accesories courtesy of Latham. The one pictured is mounted to the transom rigid w/ a piece of angle, mine will have a hinge and custom rigged to work w/ my L.E.D. indicators. Ben wants to fabricate some verical pieces out of 1/4" powder coated aluminum that will extend rearward of the transom 12" or so acting as a tunnel extention which will prevent the air from escaping around the sides / edges of the plastic tab itself. The race boat pictured doesn't have those.

Ben also recommended shortening my sticks & adding individual drive trim switches to each. Currently I have 1 switch that operates both drives but they don't always move up or down at the same rate. Hope to be able to add a 3rd switch to the side of port throttle for the tunnel tab.

Details & pics to follow.....

While he's doing it. Have him make a couple extra tabs. Wouldn't be that expensive. I noticed CRC's tab was warped and discolored a bit. It would be nice to have another with the same dimensions you could just throw on.

hay mike what effect did the weight have on it and good luck with the tab i ran my new props the other day 30 pitch 15.5 dia herrings definetly better did not have enough test time had to go home to the snow storm and it was a little choppy when we were testing so not flat but definetly better could nock down the bow with the throttles when porposing which i couldnt do before going back down for miami show will do more testing the week after will keep you updated