Need ideas to stop porpoising?

[gss036]

Got the new Honda 225 installed and have 10 hours on it on my 1989 Seacraft 23WA. When there is a little roll on the water the boat tends to want to porpoise. I had moved 20 # lead up front in the anchor hole in the bow, after yesterday still doing the same, added another 40# lead. May get out again Tue or Wed. The 225 has awsome power, but you do know you have the extra 220+# on the back compared to the 200 hp Merc. I have about 6 hours on the current fuel, so will fill it up again when I go out to get an idea of fuel burn for the 6 hours running. I am running a 15 hp Honda off the main tank, but that thing does not use a lot of gas just trolling.
I am not getting any water through the scuppers, sure need to watch the big wakes from the stern, if you can't get turned in time. I do get a little water into the engine well with the wakes, but they drain right out. I had to pull the hatch and reseal it good as the engine installer had to replace the old one because of the orginal engine bolts and did a lousy job sealing it.