Clarification on scoring rules needed

I am currently working on scoring program for online contest. I am
implementing the SSA rules according to the
http://sailplane-racing.org/Rules/Ru...5SportNat.html.

Can anyone clarify the rule 11.5.7 about the Short Task Factor?

STF = (TOC of Finisher with BESTSPD) / SMTT

whe
TOC - Actual Time on Course
BESTSPD - Best HCPSPD achieved by any Finisher
SMTT - Standard Minimum Task Time

My question is:
If there are more than one finishers with the same BESTSPD but with
different TOC (due to handicap), which TOC is supposed to be used to
calculate the STF?

-Wiktor Kozlik (VK)