The main problem you will find , is that your well priced mule , often gets knocked off by the fav .

Try & bet races where the fav is paying $4.00+ , they tend to fall over more.

Try & limit your selections to 3 horses.
If you are going for 4 horses , try & make one of the 2 shorter priced mules as a saver bet to minimise outlay .

Try not to target races which require you to outlay at an odds on situation , E.g. outlay $25.00 to get back $50 =$25.00 prof is good ,but no much shorter than that.

The strongest Dutch betting method I feel, is to bet to get back a pre determined amount E.g. Get back $50.00 divided by the price , but try & keep the outlay around $25.00 & less.
If it looks like you are going to overstep the $25 mark , just increase the 2 shorter priced horses by 1 or 2 points to make it balance ,to approx a 50% outlay to possible return.
I like this approach more than the other 2 types of Dutching because it puts more on the shorter horses & less on the longer priced horse , thus saving unnessary outlay for the sake of a greed thing ,that more longer priced horse will get up than shorter priced horses ,which stats proove they dont.

A progressive staking plan that can work ,is to increase your target by 15% after any loosing bet, until you are in front .E.G. simply multiply your $50 by 1.15=$58 etc.
Then start again, once in front no matter how small a profit ( this is the important bit) otherwise it will kill your bank.

You will need a bank of 100 times your base target E.g. $5000 if initial target is $50

I hope this helps in some way.

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Cheers.