Exit strategy for "in play trading" of draws

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Hello, I try to make money by in play betting on betfair. My strategy is: lay a draw before a match starts (price must be between 3.0 and 3.55) and back the draw as soon as a goal has been scored. Example: Last monday 20:45 Vannes – Lens (second division in France). The starting odd for the draw was 3.20 so I layed it for 8 euro. My Liability was then 17.60 At 21:33 Lens scored 0-1 and the price for went up to 5.6. So I staked 4.57 euro. No matter how the match will end (draw or not) I have a garanteed profit, as is seen below: Profit for draw: 8 - 4.57 = 3.43 Profit for none-draw: 4.6*4.57 - 17.60 = 3.42 So this was a succesful trade. But it's not always like this. For example if it's in minute 75 still 0-0 the price drops to for example 1.65. In that case I want to shorten my liability (because I dont want to loose my entire stake) so I back the draw for the same price as for which I layed the draw (8 euros in this example). My question is: is this a good "exit strategy"? Or are there better ways to minimialize my risk in case the price for the draw is going down. Any help is appreciated!!!

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Re: Exit strategy for "in play trading" of draws do yourself a favour, take notes on 1+ goals total goals market, see which one give most profit (for the same matches obviously), you might be surprised ;)