I would like a more realistic nozzle moving. Fully opened at idle - it is ok, fully closed in max dry power, maximal regime, or max RPM (called as you want) is also ok, but on max afterburner, the nozzles are opened full again, however, the pressure in the hydraulic actuators are working continously against the pressure inside the nozzle.
A normal diamater at max AB is app. around 90% of the idle position, which is the 100.
A fully opened (idle or stop position):
http://www.airliners.net/photo/Russia---Air/Sukhoi-Su-27SM/2327622/L/&sid=8c91ae78e823a4a2c8e659de9fb405a6
http://www.airliners.net/photo/Russia---Air/Sukhoi-Su-27SM3/2295543/L/&sid=e60795ae8d53136cfd06c9c671095b78
And the max AB diameter:
http://www.airliners.net/photo/Russia---Air/Sukhoi-Su-27.../2388438/L/&sid=81ccd280f5738cf99a027ce1ca7cfa37
http://www.airliners.net/photo/Ukraine---Air/Sukhoi-Su-27UB/2347627/L/&sid=81ccd280f5738cf99a027ce1ca7cfa37
http://russianplanes.net/id109081
It is true for any other airplanes too.