i was encountered with this very uncommon rule while i was traveling east asia.

6D
S17
DAS
Double on any 2 cards
Split twice(so you can only have 3 hands total)
No resplitting aces.
Spades and hearts BJ gets 2 to 1 instead of 3 to 2 (like spade ace + spade J or heart ace + heart K)
Late surrender

i thought it was off the top edge when i first saw the bj rule, but then there were some disadvantages on those splitting part. what is the exact HE on this game?