dic181 ,
You left out the resistance of the motor. That is needed for running simulations.
Iused the value of 0.015 Ohms that was already in my MOTOCALC program. (May need to double that for 2 phase resistance given some certain online programs such as on Castle Creations and NEU web sites).
If you want to run the amps near the top of the specified Constant Current rating for your pack then look at 4.5X4.5 or so....You might want to buy APC E 4.5X4.1 pending the results of your wattmeter.
If simulations are correct, the motor may easily handle 4.75X4.75 if it had enough cooling air to it....Funjet does not shine in that dept (cooling air to motor). So it appears the bottle neck of your setup is the battery packs.
That does not mean setup is bad, it just means the motor may have an easier time of it than those packs.
Possibly themotor can handle 60 to 60+A with good cooling air and heat sink.
Hopefully you have a wattmeter to verify my simulations. Ihope to hear that your Funjet flies at roughly 120 MPH with 4.5X4.5.
You can always parallel (2) of your packs as 4S-4400 25C for longer flights, more power and much cooler pack temps…make sure that you can C.G. your bird.
Some people may run 5X3 props for much better climbing at some cost to speed (With that prop the static amps will drop/unload a good amount of AMPs at max speed in level flight but they will spike to static AMPs every time you go vertical).
During (quick and early landings) and after the first few flights check your motor and battery temps...consider a motor heat sink such as 28mm diameter X 27mm length from Medusa or MPI.
Use throttle control as needed instead of non-stop full throttle.
Good luck,
Gryphon