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pump head

Last convector on loop doesn't get hot. Taco 110 on return side of boiler. 1-1/4 mains with 1/2" branches. Pump should be on boiler supply. Taco 110 pump to small??? It's har to believe.
My math
1-1/4" pipe good for 14 gpm
Longest circuit about 150 ft. =
150 ft + 50% * .04 = 9 ft head
Taco 110 max out at about 7 ft head for 10 gpm
Taco 007 is good for 6 gpm @ 9 ft head
Taco 0010 is good for 19 gpm @ 9 ft head
Is taco 0010 the right pump for me??
Please help


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