Fred your method is actually confusing if you think about what you're saying. I hope I'm not out of line offering an alternative.
1) if your strings start in the throat, pre weave the center six mains and clamp R2 and R3 about 4" from the frame at the top. I would leave enough Ron so a clamp could be placed on R2 above this first clamp.
2) tension L1, your will have a higher tension on L1 than R1 because of string to frame friction at the bend at T1 on both sides. You can tune R1 and L1 by lightly tugging on L1 until the frequencies of L1 and R1 are the same then clamp L1 and R1 as near the frame as possible.
3) tension L3 and again tune 2nd and 3rd mains before moving clamp.
4) tension R3, remove clamp from R2 and R3 and tune R2 and R3 before clamping.
When all the throat strings are tensioned move to tensioning and clamping 1 string at a time. That 'tuning' is explained by @David 110
in this video where he pulls from the top on and old Prince stringer.