This seems to be an outlier, typically on that hardware sqm's shapers top out at around 60 to 70 mbps (combined uplink and downlink). simple.qos/htb/fq_codel will keep the latency low in that condition, while piece_of_cake.qos/cake will allo the latency under load to increase a bit more regaining a bit more bandwidth, but no matter what we where never able to reliably shape at 140 Mbps on that hardware.,, Sorry, if this is not the answer you are looking for.
These sirq numbers look really low, how did you measure? (I recommend to log into the router during a speedtest and run "top -d 1" and keep looking at the idle and sirq numbers, whenever idle gets close to zero your router is out of CPU cycles...)
Thanks for the other information, you are right in that I really want to see that; but I can not spot any issues with these files at all.
Best Regards