Joe,

Congrats on getting the ApolloS.
Battery weight seems unusually light. When I flew 50 sized Sebart planes on 6S 5000's they were 700+ grams for 25C - I use Hacker Eco X batteries for my 2M planes and they have great durability and are light, even a 6S Eco X-5000 weights 653g and the 6100mA version weighs 766g. Once you get to fly the plane and can fully determine the best CG for you then you can determine what options are available to eliminate the nose weight - bigger capacity batteries and changing the ruder servo to closed loop are 2 options that come to mind.

Steve