satrianiRewards are calculated from inputs size, not from the wallet balance. You can have the same sum using completely different inputs set, 1x600/2x300/4x100+1x200/etc. Inputs could be listed using
listunspent RPC command.

If you have one 600 coins input, then you can split it into into inputs set by sending it to multiple local addresses. Just create some addresses and send your coins to them.