Cleon
Legend
I think there is the same issue with the dragon form since it still says "same as base creature or base dragon, depending on which form the weredragon is using."
What if we say
A weredragon in hybrid or dragon form gains two claw attacks and a bite attack as natural weapons. A Large or larger hybrid or dragon form gains two wings attack, a Huge or larger hybrid or dragon form gains a tail slap attack, and a Gargantuan or larger hybrid or dragon form gains a tail sweep attack, provided the base dragon has those attacks when advanced to the corresponding size.It does sound a bit complicated, but I think it says what you want.
No, that's worse.
In dragon form it just has the natural attacks of dragon of its size and type, which may be different to its hybrid form.
A standard True Dragon has bite and claw at all sizes and gains wing attacks at Medium, a tail slap at Large, a crush at Huge and a tail sweep at Gargantuan.
You didn't want the hybrid form to have Crush attacks earlier, and I would like the wings and later attacks to kick in at a larger size because I didn't want the Medium size to have wing attacks,.
Hence the earlier proposal that the Weredragon has bite and claw at all sizes and gains wing attacks at Large, a tail slap at Huge, and a tail sweep at Gargantuan.