I might bring the ball and chain and the young fella to run round the park causing havoc while swap takes it's inevitable course. So I'll be grabbing a site in the next few weeks. Far enough away from the action so the Missus can sleep.
Gents husky obvious has an addiction.... to shiny stainless, being the suportive bunch that we are, we should be encouraging him to attend meetings.
Like a couple local brew clubs to get thing wet and dirty!
Also remember restricting the flow at the inlet is way worse than at the outlet. Also these kk pumps clog fairly easy I don't know you cleaning regime but if you haven't yet pull the head off and give it a clean.
The guys above are correct, and slow recirc will show significant mash bed lag. However your mash bed temp isn't the important one. The temp at the exit of your hx is what you need to control. Having said that a centre flow march 815 would probably show marked improvement.