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Well, I typically remove all the hoses I can when doing the final flush, and flush all the heaters separate from the engine/radiator. That way you know it's all flushed and cleaned well. Doing it that way a lot of the water drains out by itself when the hoses are removed. I'll also pull block plugs to drain as much water out of it, as the engine and the radiator are the primary possessors of coolant capacity. So long as you ensure those 2 are empty, the residuals are usually taken care of by the 60/40 coolant/water bias.
If I'm really worried, I'll use an air nozzle to blow out heater cores and hoses, but I wouldn't recommend you doing that because 100+ psi of air pressure not feathered correctly can blow hoses, heater cores, etc. So just don't do it. Maybe you can try and use a shopvac to suck the water out of the loop instead?
IMO, so long as the hoses are all pulled and gravity drained, and the block+radiator are also drained, a 60/40 mix will put you close enough to where you need to be. If you don't get all the water out that you can, go heavier on the mix. It's just a gut call really.
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