Gentlemen,
A very interesting thread indeed.
With regard to the screen height - I believe it is limiting only if the Takeoff is performed under a Field Limited scenario.
Where Takeoff is Climb Limited, Obstacle Limited - the screen height is less of a problem - you will cross the end of the runway with ample margin - simply because the weights that limit you will be below the Field Limit i.e. stop at end or cross end at 35 feet(dry). On majority of Takeoff's - field is not the limit - unless operating out of really short fields.
By using a wet V1 on a dry runway - I believe you will still cross the end of the runway at 15 feet. The Wet V1 was used to improve the stopping performance not the Go criteria which was calculated to cross the end at 15 feet. Contaminated would be different as the V1 is calculated for the slower retardation and also slower acceleration should you choose to continue.