I would ride the course as follows:
Begin at START, ride the first loop, taking a count at FINISH enroute to finishing the first ride loop at START.
Begin again at START, ride the 2nd loop, taking a count at all intermediate splits, including the TA. Complete the ride at START.
I’d now have all the information required to make a spreadsheet showing the measured positions of the entire course and all its splits.
I don’t believe it necessary to ride the last three loops more than once. The first ride of this loop gets it all.