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The thing is, there's no advantage to targeting horses to lose unless they're among the favorites. If two or three horses with the best odds stumble across the finish in tenth place, they will certainly be tested.

The handicappers in Hong Kong have a different world to work in than anywhere else in the world. Horses coming into the country have to clear quarantine which is a slow and expensive process. There are a finite number of race horses on that island and the people who do the math have all the stats on every one of them. The second part of this is that there are not very many places for them to run so they know exactly how each horse runs on that particular track.
It's all a matter of changing the odds to be big in their favor not about a sure thing.
If you can slow down three of the better horses in a ten horse race with drugs and then drop the worst three horses out of you mathematical calculations you can alter the outcome 100% of the time. You would be dropping over 80% of the possible winning combinations. If you had several shills betting the different win show and place bids at 100 to 1 you could clean house. Not every time but a lot of the time. That would change the odds in a huge way.