I was wondering about that too. I was going to ask a) how 5 gallons were going to cover that much and b) what you were going to put 79 lbs into to rack onto.
Not sure how sweet/flavorful the pear juice concentrate is (or how much), but just remember that it'll be easier to add more then to take it out. Especially if you don't want it cloyingly sweet. Every time I think of canned fruit I just think of those super sweet and syrupy juices they come in. Wouldn't want it to overpower your cider.
5 gal EdWort's Apfelwein
4 gal Strawberry Vanilla Melomel
1 gal Cyser
Vanilla Cider Wine, Spiced Cider Wine, Cider Wine, Summer Berry Cider, Caramel Double Apple Cider, Caramel Double Apple Cider (oaked), Skeeter Pee, Brandon O's Graff, MAOM, EdWort's Apfelwein