I guess I wasn't clear what you're talking about - when you say one-handed riffle shuffle weave do you mean on the table?
If you were talking about the in-the-hands weave... which I guess you're probably not... Anyhoo, it's not harder at all to slightly offset the halfs, all this indicates to me is that you don't own the Encyclopedia of Playing Card Flourishes (or the companion DVDs) or if you do, then you ignored them.
when you say "sounds like to [sic] much work ... to do a perfect one-handed giant fan" that is EXACTLY what I meant when I said less than 1% of flourishers would be willing to put in the effort. yes, it's hard, different people have different amounts of dedication to this art

but if you just stick with it I think it will not be that hard. I have only been flourishing a couple months and I can already do a totally one-handed giant fan, but not perfect yet... but I can definitely see getting there

and it doesn't take "too long" as you think it would "ruin the aspect" , Jerry does it in like 3 seconds
it's totally cool if it's not your thing though! I just think it's one of the sweetest flourishes out there so I'm going to practice until I can do it perfect, simultaneously, in both hands

you might rather spend your time learning the Jackson 5 or some cut or something, everyone likes different stuff and that's whats great about XCM ! be original.