What is the span 28?
Radial mounts are great heat sinks, thermal set NV can always use some help to gain top end.
The ones I tested / approved for Kamtechnik are the best I have two other kinds to compare
a break away and larger dia. version meh no comparison. Kam cools better bit more mass.
With the beams removed the weight gain is minimal.
Billet lower case with bearings would be nice.
I vote give the venturi some air / as the engine cools in the air setting goes rich / needs more intake
to keep the mix balanced or set NV level and hair lean.
I like longer tail moments it smooths out any quirks with less needed trim.