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Yamas, I think it was 10-15 years ago that the QE2 (and you know they don't give that to average skippers) actually bottomed out and did some damage near Cape Cod (Mass.) because even THAT ship "squats" at speed and the stern lowers.
With any displacement hull, as you move faster and displace more water, you dig a "bigger hole" in the ocean, and the stern especially drops deeper into the hole. You probably could trim more bow-down, but then you might find the trim was wrong when you were sailing at slower speeds. Getting a hull design to "do" it all and "be" it all under all conditions, is quite a good trick.
If you've got weight added in the stern (tankage, batteries, anchors and chain, bigger than original engine?) you might try shifting it forward to see what difference it makes. Or sending a couple of heavy crew forward as ballast--that's sometimes a very good way to trim for conditions.