A bit of oil loss is normal, loads of info on this forum, all could ever want to know and probably a good bit more!
In the "living with a Rohloff" booklet, Andy Blance's recommendation for oil changes is:
Double flush
Add 25ml
Mix well
Remove 18ml
I follow that, it leaves the 7ml that's always there coating parts, and a further 7ml, it also ensures what is in there is cleaner than with any other method. The only drawback is you lose the sound deadening effect of having more oil in the hub, at least till it leaks out!
Whatever oil change regime makes you happy, they're probably all excessive, parts need a coating of oil and that needs to be kept free of too much contamination. Many ways to achieve that and any more than that isn't of benefit.
I wa thinking of draining a bit before we box the bike for travel.
I wouldn't bother either, if you've done a few miles I'd be surprised if you got more than a couple of ml out anyway.