I am not sure if I was very clear on that Adj Ticks box

+4 if Lay betting
-4 if Back (Win) betting.

Try not to get them confused.

In Sim mode , I always have Adj Ticks box set at 0
This is done to reflect the price shown & not the reduced ticks price.

Betfair has a best price available policy , meaning , if one where to submit a Win bet with say 1.01 on our price but showing at say 6.00 on Betfair screen, then the bet gets put on at 6.00 or slightly less if price drops, which is a better price for the Win bettor.

Correspondingly if we where to put on a Lay bet at our price of say 6.00 & its showing say 1.01 on the screen , the bet would go on as 1.01 which is a better price for the Lay bettor.

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Cheers.