Your volumes are obviously off substantially. You need to be accurate with grain absorption, dead space, and boil off rate for your kettle. Ideally you want to collect exactly the amount of wort that after absorption and dead space losses will leave you with your target fermenter volume plus the amount of evaporation in your boiling period. As for being 1% low on abv, you're not getting the same efficiency as your friend, ie., you're not extracting the same % of sugar from the same malt bill. Figure your efficiency on this batch using beer software and you'll be able to adjust your grain bill to hit your target next time. And BTW, I stir my mash thoroughly to get a steady temp (my target mash temp), close the cooler lid, and leave lone for the mash period. Also, hops will absorb a fair amount of wort on big IPAs, but not 1/4 of your yield.
EDIT - I think it's a combination of all the above, but all are easily fixable. Good luck.