i think the majority of the windsurfing communities idea of 'balanced lines' are in fact still to far forward. It is possible to sail no hands on a windsurfer, and it gets easier the FURTHER forward the lines get, it makes sailing with bad technique manageable. but this is not fast or efficient.
hence the scientific term "sailing like a girl" which is the same as other scientifically valid terms such as "throwing like a girl" and "running like a girl".. nothing to be ashamed of but there is room for improvement.
I know 1st hand from working in the instruction/rental industry that 90% of the public sail with their lines way to far forward. Every time I jump on someones Gear i have to move the lines back!
And i would bet good money that antoine would move the lines back as well.
Cribby is right, Its worth listening to advice from professional instructors, and hes the best instructor Ive seen. and he changes thru the nose because hes the best. (one of his billionaire clients turned up in a power yacht for some intuition, so most can afford it.)
this is what Im talking about, Its the first photo i found on gaastra.com.. finn is less skilled than antoine but it must be noted that these guys are sailing way more powered that the average joe.
so if antoine says back hand pressure he is a freak anyway with arms like Godzilla and shouldn't be listened to for advice.
yes im not using my harness in the video, but i am flying going into those move and thats all down to stance and setup.. the faster u go into move the fast you come out.