old smokey
In your message in bold, you refer to a contaminated runway. Things might have changed, but rules regarding contaminated runway refer to more than 3mm of water and/or slush etc, not a wet runway. In the contaminated case, screen height of 35 ft for dry, 15 ft for wet, was reduced to zero.
On the BAC 1-11 I remember, the difference between V1 and Vr was some 40 kts, a long wait on both engines, never mind one.
Aircraft performance legislation and certification is a fascinating subject, unfortunately somewhat ruined by the over complex performance "A" examination, which put pilots off the subject for life !
PS : Is it still on the L1011 or have things ( I hope) moved on.