Using the old MPH and entering TM variants

[Jeebs]

Originally Posted by Bill V.

Now if the TM is 10 I take 1/2 of the 10 ( I round up odd number variants )
and add 5 to 20 and enter the variant as 25 in a route or 23 in a sprint

for example using this horse
#1 Dilatory
Line 1 The TM DTV is 6 and its a route
so I take 1/2 of 6 = 3 and add it to 20 and get a DTV of 23

I'm lost. Would I multiply that 23 variant by +0.15 (apx. the FPS value of a length per Ken Massa) to get a variant total of +3.45? Or, do I take the initial TM DTV of 6, multiply that by +0.15 to get a variant of +0.90?