Charly,
Don't think you will ever need a pipe damper. If your flue SURFACE temperatures were the same as the stove top temperature you may have a problem, but from what I am reading/seeing in your posts, it looks like you are reading the flue gas temperatures. Woodstock says the temp in the firebox is double what the stove top thermometer reads, so if you got a 400 degree stove top and 400 degree flue temp, then another way to think about it is you have an 800 degree firebox and the heated air/smoke going through your stove is half of that - and that's OK. You also want warm/hot air moving up your chimney to keep the flue liner warm, preventing creosote condensing in the chimney and helping out with a strong draft.
Another thing is the cat doesn't have to be glowing to be working. My reality check for the cat and if or if it ain't working is smoke out the chimney. No smoke, the cat is working.
I have a Woodstock Keystone and based on what I've read, the Fireview is very similar in control and damper settings. I'll give a little different spin on your damper settings. If your wood is really dry and you damper down to 0.5 or lower, your cat will burn ultra hot as it is totally crunching the smoke (no flames off the wood in the firebox - glowing embers, no flames) and your stove top should be shooting towards 700 degrees and beyond. I would not take the damper to zero unless you are there to keep an eye on it. But the beauty of a cat stove is that you can dial down the damper, snuff out the flames burning off the wood and get some great heat without burning a lot of wood or driving the room temperatures crazy either. Of course if and when you need more heat as the temps plunge, you can open the damper some too. My Keystone generally runs a 500 stove top and the damper is between 0.9 to 1.25 depending on the heat output. However, if you are at 0.5 or less and your stove top is not heading up near 600 to 700 degrees stove top, then your wood might not be as dry as you might think.
Bottom line is you have one of the BEST woodstoves EVER made.
Forget the stove pipe damper, forget the flue gas temperatures, learn your stove's damper settings and enjoy the burn.
Good luck,
Bill