Don, an 11kbtu R22 compressor will put out less and be less efficient at low source temps, high lift or both-Be careful running against minimum pressures or high pressure ratios. It will put out more with high temps or lower lift. Be careful running against the power or mechanical limits of the compressor. The difference can be as much as 50%, as I described
HERE. You can probably find the chart describing this compressor's capabilities by searching it's model number on the nameplate. Running R290 will boost its capabilities a bit also.
If you combine numerous approaches such as annualized storage plus a buffer tank, you can size for average load, not peak load, which sounds doable based on your numbers.