ESBE Mixing Valve/Logitech Question

Hello. Long time reader of this forum, first time poster. Received much help from the info here over the years.

I'm an electrical contractor west of Boston. Have wired many boilers and controls over the years. This summer I did a remodel with an addition to my own house. I laid Warmboard R radiant in the entire addition and the remodeled rooms of the existing house. I ran all the pex and brought it to the manifolds and had the plumbing contractor do all the main piping and manifold connections.

I have an oil fired Buderus G125 with Logamatic R2107 control. After discussion with the plumbing contractor it was decided we would install the FM241 expansion card into the Logamatic to control a 3 wire floating mixing actuator. The plumber installed a Danfoss mixing valve with an ESBE actuator. There is no primary loop with a pump on this system. The system currently consists of a basic main rigid manifold with two zone pumps. These pumps feed baseboard in the untouched 2nd floor area and a first floor untouched baseboard in the living room. A line from this manifold was taken to feed the hot side of the radiant mixing valve. The cold/return was piped back from the mixing valve to the return boiler manifold. The radiant system pump was installed after the mixed output of the valve. The radiant system has two manifolds with Uponor zone valves opening and closing the loops by zone controlled Taco zone control relays with end switches to call the pump. We just got our first cold blast this winter and the heating system as a whole seems to be working ok.

All that to ask this question. With all the boilers I have wired this is my first Logamatic to ESBE actuator. Nor have I seen one run. I have wired Uponor radiant controls in the past. Is it normal for the Logamatic to constantly be making the ESBE actuator adjust? I mean non stop other than a second or two for temp check I assume. Back and forth. Its not a major swing, but it's almost like the Logamatic is hunting for the right mixed temp, but keeps overshooting it. Or like it's not waiting long enough for the mixed sensor to report back it's temp and then when it does get the info it's too late and needs to stop and swing the other way, only to repeat. (The mix sensor was originally located 3' away from the valve. I moved it to 12" away from the valve to see if it would help reaction time. It did not.) It would seem the system needs to move the valve in smaller increments and wait for the temp from the sensor. Then adjust. It is doing that in a way. But it is over shooting the hot input by adding too much hot water. Then it compensates by swinging back to mixing in more return water, but goes too far and cools down too much, then compensates by swinging back to hot, but again overshoots and keeps cycling back and forth like this. I can put my hand on the pipe and feel the temp swings. The Uponor systems I am more used to make much smaller adjustments, wait, adjust, wait, adjust etc, all with far less mixed temp water swings.

I understand there will be some adjustment going on to compensate for a cooling boiler or cooling return water or room temp swings etc. But is it normal for constant back and forth adjustments? Perhaps it is. I just need someone who has seen this setup work tell me if it's normal or what might be wrong. It seems to swing back and forth a 15-20 degree or so range.

Thanks for the help.
Mic