Drive line angle questions

[sfont66]

Truck is a 72 C10 SWB with coil spring/ trailing arm rear suspension. My current angles have the transmission at 3.6 degrees down, and rear end at 2.3 degrees with pinion pointing up( sloping down from front to back) drive shaft is 1.3 degrees down. So in order to get the angles closer to correct, I have been trying to find a 1 degree or even a 1.5 degree shim for the axle. I see Cpp had them in the past but now I can only find 2,4, and 6 degree. Same at Speedway, and Brother’s/Holley. I find 1 degree shims at Summit, but not sure of fitment and they don’t have dimensions for length, and are special order.
I do have 2 degree shims on hand .
I have talked with Silver Sport Transmission, and I seem to recall they recommend that I try to keep the transmission at 3 degrees if possible, and I can’t raise it any further without cutting the floor of the truck.

So my question is: does anyone know where to purchase 1 degree shims, or should I install the 2 degree shims, making the rear 4.3 degrees, and then lower the transmission to the 4.3 degrees to make for more optimal driveline angles??
Can anyone see a problem with the engine /transmission being at 4.3 degrees down?
Any advice is appreciated
Thanks