Alan,
On my NA Solstice I found the 275s were a nice handling compromise between the 245s and the 285s. Have tested all 3 sizes, but never the 295s. As you know, there are different considerations involved between the GXP and the NA Solstice. The tall 275s & 295s are just not the best option for the NA Sol. However, on the GXP they should be the two best choices. My hunch is that the 275 size is the best choice. Keep in mind that I haven't tried the 295s, and that my hunch is based on T&T comparison of the 245s; 275s; 285s.
Dan
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Dan
C-Stock 94