Look, I'm a bit biased here because I did French, loved it and now it's my major at uni.
However, I think there are lots of good reasons to do French over HHD. Firstly, it may not directly help you with med, but I think a second language at VCE level looks good to future employers in any field. Secondly, while it's challenging, I think challenging subjects are good for developing effective study habits and persistence. Obviously if you hated French I wouldn't recommend doing it just for the challenge, but you seem to like the content.
Thirdly, on scaling. I have kind of an unpopular opinion on scaling compared to most people but I actually think it is a factor people should consider in subject selection. For example, I chose to do Latin partially because of the INSANE scaling. Now, if I'd hated Latin or not been very good at languages, this would have been a bad choice but given languages are one of my strengths anyway, it made sense to do Latin over another humanities subject I might also have enjoyed, e.g. history. I got a raw 35, which scaled to 49.63, meaning I'd have needed 50 in most other subjects to do better. This scaled score was worth a lot in terms of my ATAR, even compared to my 47 in Psych.
However, that's just my personal experience and I can understand why you'd opt for something easier as a year 11 student.