The F-18 does mach 1.8 only on arfterburner and flying clean at altitude, and barely pushes the sound barrier when not.
The su-35 is known to be able to supercruise at a speed of at least mach 1.2 (actual top speed classified) and has a higher stall speed than the F-18 at 130 knots.
That you would scale down the performance of the su-35 for arma I can understand, that you would do so in a way that's completely inconsistent not just with reality but also other mods by the same author, now that I cannot.