Have you tried speeding up? My old Mainship 34 is rocky at displacement speeds but gets much more solid and secure in waves at semi-displacemwnt speeds.
Tell us more about the boat!
Definitely give this a try. A lot of boats will ride better with more power applied. Getting into a worse part of the power / drag curve makes the boat's motion less affected by waves, as the bit of additional drag, etc. from hitting a wave is less significant relative to the drag from pushing through the water, so the loss of speed, etc. is less.
Op doesn't say what his power plant is but many Thompson trawlers (most) are single engine 8 kt boats.... 4-71 DD's were common in these boats
I have a 1978 Thompson Trawler 36’. I have completely restored , but found that it is extremely rocky if caught in waves or wakes.....is this a common problem with these Trawlers, or is there any suggestions? Appreciate any help.
Even on a slow boat throttling up can help the ride. There's a lot more drag (and a lot more power applied) to hold the boat right at hull speed or just above (if it'll do it without the engine at WOT) than there is a knot below hull speed. Even though I've got a planing hull, if I'm running off-plane, the difference in ride between 6.5 kts and 8.5 kts (where I'm pushing just past hull speed and plowing a bit of water) is massive.