Hi Enjay,
Yes , there is a simple answer to this.

In Sim mode it matches everything it sees on screen.

But when real money goes on , the actual price can drop a little as the bet is going on at the same time.

So one has to use the price Adjust Bet Ticks box set to -4 (or more)
Make sure its -4 & not +4

We could use + 4 if Lay betting only.

This now allows the the drop in price to be captured.
I have found -4 captures all bets ,even if betting in the hundreds of dollars

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Cheers.

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.