Stuck exhaust valve? Or bad Surefly timing?

[Tokirbymd]

Had surefly modified this week to take advantage of advanced timing (PA32-300), oil changed, cylinders borescoped, spark plugs rotated. Post-maintenance flight. Normal start and runup, #6 CHT significantly cooler than others (but changing over time so don't think bad probe). Have sent JPI data to my mechanic and Savvy and await analysis. Climbed over the airport to see if it would even out. No change with mag check in flight or leaning. Landed and cylinder warmed a bit to equal others at idle. Any thoughts?

 

[EchoDelta]

 

[Tokirbymd]

 

[arzenmaster]

 

[Tokirbymd]

 

[Orest @ CYFD]

 

[Aviator305]

 

[Tokirbymd]

 

[Tokirbymd]

 

[EchoDelta]