-comes in dressed as Mr. X- Sorry had to do that xd
-starts doing the handseals again and concentrats more chakra on his foot anf stomps the ground again in order to create a proper jet- o.o
*the scarecrow arm flaps around because of the water*
here's a point for you... adding more chakra does indeed make a jutsu stronger... but not always will it increase it's effect. take this needle and this thick nail for example. there is more metal but the nail isn't necessarily more dangerous.
*pokes you on the neck with the nail and not much happens, just a prod. with the needle i poke you exactly the same and it pierces your skin*
the whole point is to control your chakra into a cutting high pressure stream... adding more chakra makes it harder to control, and without higher level of chakra control it would be harder for you to control the excess chakra to concentrate it into a tight stream.
(btw i call it a stream, you may think i mean like a water pistol, but it's more like a blade of water rising from the ground between you and your opponent)