VR>V2 that's what caused the whole perplexity, not speeds increments in line.
I take it the crew simply misinterpret the sentence of increasing all V speeds to the performance limited TOW. The way I read it is that if TOW is below the RTOW than one has the option to apply RTOW speeds but VR increment is limited to TOW +20 Max. However all speeds are increased in line. Airbus does the same by applying the optimized speeds which are rather in the upper range.
Interesting enough Boeing in the very next sentence recommends following:
If windshear is encountered at or beyond the actual gross weight Vr, do not attempt to accelerate to the increased Vr, but rotate without hesitation.
That however contradicts the very idea of having higher speeds.
As for how to determine the point of rotation Boeing does make a sensible recommendation of
Windshear encountered during takeoff roll:
If windshear is encountered prior to V1, there may not be sufficient runway remaining to stop if an RTO is initiated at V1. At VR, rotate at a normal rate toward a 15 degree pitch attitude. Once airborne, perform the Windshear Escape Maneuver.
If windshear is encountered near the normal rotation speed and airspeed suddenly decreases, there may not be sufficient runway left to accelerate back to normal takeoff speed. If there is insufficient runway left to stop, initiate a normal rotation at least 2,000 feet before the end of the runway even if airspeed is low. Higher than normal attitudes may be required to lift off in the remaining runway. Ensure maximum thrust is set.
Well, that settles it for me at least.
following applies to V2
JAR 25.107 Subpart B FAR 25.107 Subpart B
V2 is the minimum climb speed that must be reached at a height of 35 feet above the runway surface, in case of an engine failure.
JAR/FAR 25.107
(b) V2min, in terms of calibrated airspeed, may not be less than:
1.13 VSR1 (JAR) or 1.2 VS (FAR) for turbo-jet powered aeroplanes [...]
1.10 times VMCA
(c) V2, in terms of calibrated airspeed, must be selected by the applicant to provide at least the gradient of climb required by JAR 25.121(b) but may not be
less than:
V2min; and
VR plus the speed increment attained before reaching a height of 35 ft
above the take-off surface.
This speed must be entered by the crew during flight preparation, and is represented by a magenta triangle on the speed scale (see Figure C3).