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To be honest, I wouldnt put it in charge battery as it will charge also when adding a bit of ICE power on the flat bits. Only a continuous descent could be done in save battery mode.
In any case, light to moderate braking is the generator, only harder braking are the discs, so you will be charging quite a bit on a downhill stretch in any operating mode, and in the uphill stretches, the battery will assist in case needed so no need for sport mode per se.
I would assume there is no need to mess around with the settings to achieve your goal. But like "X5 45e" i have no exprience towing.
If however your battery is used on the way to the first hill, you might want to use the charge battery to stay at 80% or so.
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