The -200/300 werent recertified, therefore the version of FAR25.109 that applied when the aircraft was certified still applies. As a Boeing operator, look at myboeingfleet.com and you will find a powerpoint presentation on the subject.
therefore subtracting 8-10 kts from the V1 and using that as a decision speed.
No we dont, V1 is V1.... Its just the logic that was changed to encourage crew that if they reach V1 then its GO.
Mutt