Boy oh boy, this is a blast from the past !
First, follow OEM guidance in the AFM.
Second, one needs to be very circumspect regarding the depth of contamination and reasonably likely drag sequelae. This can affect both TOR and ASD performance in less than predictable fashion.
Overall, this engineer/pilot would maintain his routine concern with ASD problems ... going off the end or the side, generally, is of more immediate concern than flight path obstacles