thanks for all the responses. The Indirect tank I have is about 4k. one size bigger is 7k. I reached out to armstrong to see if I can use their recirculator in my system, worth a try for less than 1k and I had one at an previous home and really like how they work. So going to add one to this system as well.
On a separate note, my HTP is showing an error 61. Could be the fan or the control board. Anyone have a good place I can order this parts online? Not sure if related to my issues or not but want the boiler to be optimised.
Also, house built in 2008. So has whatever EPA wanted at that time in terms of flow. Lots of Hans Grohe/Rohl fixtures.