I am replacing the boiler in our home and purchased individual circulating pumps to replace the zone valves. I have seven zones of which two are new. One zone is for the new 40 gallon hot water tank, which has 1" heating piping. This zone will be a 10 foot loop and I plan on running 1" to and from it.
The garage zone is new and is for 36k BTU, forced-air heater with 3/8" dia. core and 92 foot zone loop. I haven't decided on size, but I am thinking 1/2", aluminum core PEX to feed this.
The longest zone loop is 167 feet (3/4" finned copper baseboard heat is in all of house) and is for the second floor.
My main concern is the plumbing supply house has sold me B&G NRF-22's for all the zones. These are slightly beefier than TACO 007's. My browsing of the internet says this much GPM is not a good idea for the shorter zones and smaller diameters of piping. The seller says for me not to be concerned. Should I be? Is 4 GPM ideal or is it 7 GPM? Do I want to hit the "ideal" 20 degree drop in a zone? I've read that erosion and noise can occur if the flow rate is too high...
BTW, I have a 4,500 SF house and am installing a Slant Fin, 132,000 BTU, oil-fired boiler and plan on having a primary and secondary circulation style system.

Wow for that setup you will actually have to engineer the entire system to work together. There is no way I could begin this discussion without a computer profile of the entire system so calculations could be made. There are programs made to do this kind of design. You have a mixed design system with air coils/ water storage/ baseboard. If it were me I would have gone zone valves of different diameters/sizes and flow rates with one pump with a constant adjustable by pass loop with primary and secondary circuits.

You will also have to dictate which zones are more important than other IE hot water or heat as primary. It would also be best to have a control panel with all the zones feeding off it. I always say to many pumps to many problems.

I do have a three and four zone control panel for the pumps and plan on the HWT being on one primary or "priority" circuit.
I have a situation where the supplier doesn't refund but should be willing to exchange some pumps for different sized pumps. I am in too deep on this design and parts purchased, to totally change directions.
Can you comment on the questions I asked?
One confusion I have is the curve for the B&G NRF-22's covers all my zone's GPM and head pressure needs but the smaller NRF-9F/LW doesn't generate enough GPM for my head on some zones, while the other is too much. Should I be looking at other pumps?

Yes other pumps would be a good idea. This should have all been figured out in advance but some times this happens.