Actually powdermonkey, most things in your post are confusing me, but seeing as you're addressing Item No. 3....................
Perhaps you're confusing this with the rule that for an All Engines Takeoff, the TODA must be at least 1.15 times the TODR. This rule applies whether you have a Stopway, a Clearway, both, or none at all. No such margin applies for the OEI Takeoff.
Regards,
Old Smokey