Hope this makes sense, my brain is foggy from the flu.
Not always true- this depends on the frequency of the waves. Most of the times in SH$ there are 3 crsts along the hull. Each is it's own support point. So when the bow is extended past the crest of a wave there is enough support on the rest of the hull to prevent all but minor pitching.
Problem is with the one in red, jus as the two crests move further back on the hull to where the bow starts to drop, the next wave hits the bow and keeps it from dropping much.
The effect you want requires a reduced frequency in the wave crests so you have a wider trough between waves. THe next remarks refer to this very crude picture:
Looking at the pic, the wave frequency for the top 2 illustrations is too high, and the center of gravity is never far enough past a point of support to allow a severe pitch. In the upper left, the hull is supported evenly at 3 points. In the upper right, although there are only 2 waves supporting the boat, before the lead wave gets past the CG of the hull (Green dot), another wave is now at the bow and lifts it before it can drop too far.
In the lower section is an example with low frequency waves. You'll get much mor severe pitching in this situation.
Notice in the lower right the wave crest is past the center of the hull which means the bow would be pitching down. The swells are almost as long as the hull and this causes the pitching motion you are looking for.
In addition you have things like the angle of the swell face and backside and the effects of waves riding on the swell which will change the pitching motion.
To me the real culprit is not the boats but the pattern for the wave swells in game.
I explained this in another thread w/o the diagrams and discussed the fact that pitching depends on
The ability to ride up and down a wave is dependent upon:
1. The wave height
2. the trough width
3. The angle and length of the face of the wave
4. the wave frequency
5. Ship length
6. Ship Bouyancy /CG
The aforementioned relationship of waves and ship type is the reason a large ship can cut through a wave a trawler has to climb up and down. What everyone thinks of as large swells in the SH series may have height, but the other variables are incorrect to allow the boat to ride up and down the wave. Get those correct and the boats will pitch more and do so realistically.