First I used a chain long enough to use all the front cogs. It worked but the small one was unusable it flapped and and never stopped shifting. The way the swing arm works a tensioner doesn't seem posable or worth the trouble.

What worked pretty good,

It has the same range in 6 shifts instead of 7 and has a low gear close to the old setup 1:1 on the middle cog and the small is crazy low. Plus I got what I was looking for, on the 44 cog if it gets too fast or too slow one click and I'm real close to a comfortable cadence.

I put the old chain back on and adjusted the front derailleur to where it won't go on the big ring.

I realize now 13 would have been too many. A 9 with a 40 oval might be perfect. But that can wait untill I get the fork bob problem taken care of.