CSM, House edge and Variance (in comparaison with hand schuffle)

[GreenHouse]

Hello,

I have found a blackjack game with an edge off the top dealt from a csm ( model one two six). The game seems playable, so great.

I have heard from an AP guy that generally :
The house edge from a CSM is better for the player ( in this case as the house edge is at the side of the AP, it would mean that the AP has a better edge with a CSM in comparaison with a hand schuffle and normal penetration like 4.5/6). BUT also...

The variance is higher (in comparaison with a traditionnal hand schuffle).

Anyone has information, internet links to share ? I would be curious to know if this two facts are true and if so, why, what are the mathematical and logical reasons ?

I could play this game with "normal" calculations ( like if i was flat betting with a traditionnal hand schuffle and normal penetration), but if the reality is that the variance is higher that what i thought...The ROR should be higher than the one i had with my software, and my bankroll more in danger.

Thank you by advance and sorry for my bad english.