Hot water tap hard to open & close. Tub & shower taps. Mueller MU-9

for some reason our hot water taps is very hard to turn on and off. I replace the Mueller MU-9 stem and replace the seat and put new rubber packing (I think that is what they call it). But it still turns tight. There is a brass washer that fits on top of the packing (was not sure where it goes on top or below) I tried it both ways but still turns tight. Any ideas?

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.