Matt,
Thanks for the additional information. What is the temperature of your room?
One of thethings that will take your chocolate out of temper can include the temperature of the room/environment the chocolate is in. If it is too hot, the chocolate will not set quickly enough and lower forms of cocoa butter crystals will form before it sets.
The x3210 puts out a lot of heat. That could bring the temp of your room up.
Do you have any air movement over the cooling chocolate? - This will help pull heat out of the chocolate and preserve your temper. Not too much movement though. A small fan on low should suffice. - Play with it.
Is the thermometer on your machine accurate?
Also you could try raising the temperature of your chocolate on the last step a few degrees. Say to 88 or 89. The chocolate we use does best at that higher temp even tough it is a milk chocolate.
Is the chocolate melting immediately upon touching it or after several seconds of holding it?
I'm a novice too, but have learned a great deal from the generous members of The Chocolate Life.