Eddie your pipe Temp should be straight up or your pipe's are going to build up.
Yep, at 200 you
are building creosote. Those themo's can be off quite a bit. If you have an IR thermo you can double check the readings. My initial flue temps run high 5's & low 6's, then settle down to low 5's & upper 4's. Even at those temps if your wood is not completely dry(a year or better under cover), you will still build creosote. I get about a half a quart each time I sweep in early Feb, then again at the end of the season.
Eddie, if you don't have one, pick up a Sooteater. If you have access to your flue through the stove you can clean it from the bottom up using a cordless drill.
Rotary Chimney Cleaning System - Amazon.com
Use only dry wood, inspect or sweep at least once a year. Dry flaky stuff stuck in the chimney is not bad, black crusted stuff is. Remember, once creosote starts to burn it can reach 2,000 degrees and melt a steel flue if there is enough build up.
One more thing, they are kinda pricey, but I have a similar set up to this. Since my stove is in the basement I wanted to be able to read real time flue temps on the main floor. The alarm is set to go off at 900 degrees.
http://www.ebay.com/itm/Thermometer...t=LH_DefaultDomain_0&var=&hash=item2ec69adf76
An over fire can happen for many reasons, most are operator error. like trying to load during full burn, leaving the door open, leaving a primary air inlet open too much...etc.