Bravo! I think respecting peak torque when your engine has a boatload of it to spare is not necessary
If I light-foot my auto it stays around your goal RPM with the 3.55s. 55~60 MPH is around 1700~1800.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears