I really don't get that part. Max flap extension will, I'm quiet certain, only happen during final approach & landing. And post #2042 shows flaps deployed with these missiles loaded in what appears to me to be an approach set-up.Well that's really a non-issue.
When you are carrying such heavy external loads, extreme manoeuvres are not really recommended.
To try and deploy flaps completely when carrying such missiles will probably see the wings ripped off your plane before the flaps comes close to the missiles.
The "Maneuver" setting of slats/flaps normally sees them least extended of all the possible settings anyway. And with most of the external load attached to the wings, a theoretical high lift situation produced by a full flap extension will not make the wings rip off. Since all the forces act on the wing directly, and do not go through the wing / fuselage joint. If at all, the weapon mounts holdeng the missiles will fail structurally.
That is why heavy loads are normalle better placed under the wings. If placed under the fuselge, then all the stress of high wing lift vs. heavy fuselage momentum will go through the wing mounts.