Your WAY above average for that chambering. I build alot of 7mm RUMs and in your barrel length, average velocity out of my min spec chambers will usually run around 3300 fps max.
Now some will run a bit faster, some a bit lower but thats pretty close to averge for a 160 gr class bullet weight with a match barrel and match chamber and throat.
Sometimes rifles do not show pressure signs, sometimes you get a very fast barrel but as you mentioned Velocity is simply a funtion of pressure and bullet time in the bore. Powder charge really does not mean much, its the end product, Velocity, which will tell you more about pressures then anything.
Again, I would say your way over pressured for this chambering. Hell your running right close to my 7mm Allen Magnum with same barrel lengths. My personal lightweight 7mm Allen Magnum gets me 3500 fps with a 160 gr Accubond in a 26" barrel length but that round is based on the larger improved 338 Lapua design which is VASTLY superior in strength to the RUM.
My only concern is that you run into a case with a flaw in the case head or something like that. If that happened, you could have disasterous results with that pressure.
You are reading all the pressure signs correctly except for one, and the velocity is often the most accurate pressure sign you can have but the one we most often fail to listen to. Again, 3300 fps is about max I have seen from most of the custom rifles
I build, 3350 fps on the outside. Much over that and I would say your running things to hard even if there are no other pressure signs.
In all honesty, I would recommend stepping up to the 180 gr Berger, drop velocity down to that 3150-3200 fps range and you will get better long range performance ballistically with that bullet if your looking for true long range performance.
Hope this helps some.