Rather inconsistent to provide 0.275 ACH on page 3 of PDF and not actually Use ~0.3 Infiltration Factor in the calc. (near bottom of page 4 = 0.6 / 0.8 Summer / Winter).
Also, it should be noted that 1st Man J calc used SHGC 0.52 which is a NOTICABLE window tint.
I don't credit shading by trees. Overhangs and porches make a measurable difference.