2893 is a great movement. 2836 modified is, well, modified. I am sure it can be great, too. But there are many OEM watches (some that I own) that use the 2893 with great success.
I am not quite sure what I am trying to state here, other than you get what u pay for in life (within reason): A Venus 178 tends to be better than a seconds at 6 Asia 7750. At least scientific data suggests that overwhelming evidence implies that this perhaps can be said as 'true' since it is 99% out of 100%. Sure, nothing can be 'true' in entirety, but 99% dictates that for us, in the here and now, it can be implied as 'mostly true'. Hey look, I've had a Venus 178 conk out on me while my PAM 196 rep has kept purring like a kitten for way more than a year... But I'm willing to openly bet that a NOS Venus 178 is indeed waaay better than an Asia 7750!!!