This point comes up time-to-time, but it completely irrelevant.Besides, you will charge faster the lower your SoC is.
If you need to get to 70% to hit the next charger (as the OP stated), will things being equal, you will always leave faster if you arrive at a higher SOC.
In the OPs example -- If you arrive at 15%, sure you'll charge "faster" until you get to 25%, but from 25% to 70% it's the same charge rate. So essentially you're adding charging time getting from 15% to 25%.
ETA: Nevermind. I guess this was stated a while back, should've read the thread first...
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