Vref+5 is AT...Vref +10 is not
I'm not sure what you're saying.
Maybe it's this -At ALK
for VNAV minimum wind correction for the -400 is 10. The approach is flown LNAV, VNAV, A/P and A/T.
The approach is flown with the MCP speed window closed - flying at Vref+10 - until visual conditions.
No need to fly with the A/T off.