I have stopped on Betfair but I have to say over the years the bomber earned me an absolute fortune. I found I had to adapt my trading when he was around depending on what he did.
I found that the vast majority of the time he was very predictable in what he did. If he showed up I would sit that race out and just sit and watch.
If he removed the money and then when he re-entered he did so at a higher price a few ticks away form the action I would be wary if it was actually him. But if he came back in in the process taking out some of the market I would be confident it was him as he showed he wanted his money on.
So the next race I would make a judgement call as to what the horse had been doing, if it had been coming in I would be more inclined to get on but if it had been drifting you would be daft to get on ahead of him showing up as by the time he does show up the price could have drifted out further and his entry may not take it back to where I entered. So make a call on it from that point.
When he does enter see how the market reacts, does it run scared and push in further but then spring back out when he removes or does it stay at where it got pushed to, or does it continue to shorten. A generalisation but the markets tend to react in one way each day or gradually change. As has been said they may over the course of the day push back against him.
Also I try to workout how long he leaves it before re-entering, that way you could try to judge when he would come back and thus give you the greatest gain, ofcourse he may not return. It is a judgement but over a long enough period of him doing it I found the odd losses were massively outweighed by the much bigger gains I got. But this was a judgement that came with experience and knowing when it was worth risking it or not.
You need to judge how much he has left and how quickly it may get taken. Don't be sat there waiting to exit but not with your exit ready.
I would use to try to work out how much of the market he would take out if he were to use up all of his stake and then place my exit order into the market, if it was a big move I would have part of my hedge included as well. I wouldn't then just sit and wait though, I would have my order in and dragged up to a much higher price but not released. This meant that if things went to crap I didn't have to move my mouse I just released my mouse button and I exited using all the money left in the market. Yes you could sometimes be exiting at worse prices than had you not bailed but again this was a judgement call that I made each time he showed up. More often than not I would exit this way and over the years it saved me huge amounts. I was out before others had leap frogged each other trying to exit.
Hope some of that helps, but imo when the bomber is about you should be looking to make huge profits. They were some of my best ever days on Betfair and I know the same is true for others.
Embrace the bomber and what he does to the markets - it was always the best way to get my heart beating a little faster
Hope that lot helps some, there is a lot more to trading him effectively but those are some of the simple pointers.