Thats a research question. Off hand, I don't know the answer. Its not so much the weight of the extra glass as the additional leverage of everything else thats 2 inches higher .There have been several ways to estimate changes in cg,posted in these forums. Sorry, I don't have the location. Somebody else will. 2 inches might be insignificant or important. Play with the numbers.
I don't think chinewalking is an issue if you put the right engine on it. Mine had a 150 black max, more that enough power for offshore with a huge load and never any tendency to chinewalk, although flat out when it was light was beginning to feel a little bit unstable.
Having easy sitdown headroom in the cabin is huge , one of the things I love about my 25. Worth some change in cg, as long as its not large.
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