Do I need my KGB sac with and integrated bow sac?

I have a 2001 X10 and am getting ready to replace all of my ballast system as the KGB sac and one of the hard tanks are leaking. It just does not work well for surfing so I will be upgrading to a 1100lb sac in each rear locker and a 650 lb integrated bow sac.

I am wondering if I really need to replace my KGB sac or if the bow sac will do the trick by itself? That would save me from having to add an additional pump and plumbing since I can just use the KGB pump.

What are your thoughts?

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