You procedure is just about ok, but you forgot one fundamental thing: In a Fleet boat the periscope is not tied to the TDC.
US TDC does not update the gyro angle based on where the periscope is pointing, unlike its German counterpart, but based on either manual user input or PK. Sending range also sends bearing, and it's always a good habit to click the "Send to TDC" button twice whenever sending the range.
In other words your procedure needs one step corrected. I would also do this before you set AOB, just in case, and also use the real AOB instead of 90. This AOB is of course only valid for 90 degree intercepts.
3b) Point the scope to the 350 or 10. Spin the range wheel to for example 1500 meters, hit "Send to TDC" twice.
4) Set AOB to 80 port or starboard, "Send to TDC"
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