PA28-180 Take Off.
Jerry,
I note your address as AZ (Arizona) does temperature, and density altitude come to mind??
Go find a competant instructor and go over the numbers.
I also agree that light aircraft Vr numbers are not really any use. The airplane, or rather the wing, has an angle of attack that will give you the performance you require. Therefore find the correct attitude and it will fly itself off.
I had one for several years, a great airplane.
Brian