I too like to use full backspin. Here is a rough formula that I like to use which works pretty well.
add 5-7 automatically for full backspin.
add or subtract 50% for headwind or tailwind (ex. 15mph headwind = additional 7 to distance)
add or subtract 1/3 for elevation. (ex. 20ft downhill = 5 subtracted from distance.)
183 + 5(full backspin) - 1(half of 3 for tailwind) - (1/3 of down elevation). For crosswinds, you need to atleast double whatever the wind speed is. (ex. 15mph crosswind = atleast 30ft aim adjustment.)
Tweek the numbers until you get the right combination.