It seems adding the carbon reed give more bottom end but maybe lesser top end, and therefore not using carbon reeds may be a way to get the sudden power.
But i suppose more importantly is the mid-range to top end, for people who love to lean the bike low, I guess is good to have more mid-range than having more top end, this decrease the chance of slipping the rear too, but i suppose it also depends on how the rider ride his/her bike. I think the good thing about the MC28 is it natually seems to have more mid-range, so it seems to corner out better than other 2-strokes250, but the powerband is less suprising. However some people might just love that suprise peak and I do too, but so far I think for best performance I rather lost some peak for extra mid-range. This might change if one day I start to ride real hard.
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MC28, Repsol