Vince,
In this case my "vast" knowledge comes from owning two rent house pools with 1.5" plumbing and 3 HP IntelliFlo pumps.
I would not recommend running at 3450 as a normal operating speed, but it won't damage anything for the short period of time it should take to prime the pump. I keep saying that I should set my max prime speed to 2800 but have been lazy and have yet to do it. Not a real issue as my pumps run 24/7 so they only prime after some kind of maintenance or power failure. One of the pumps is over 10 years old and the other is about 8 years old.
Maybe one day I'll get around to it..
Thanks,
Jim R.