Some Critique please

[mrmenstig2]

I have recently started what i suppose is a kind of scalping strategy.
Race selection 1m 5f or less the shorter the better seems to work really well.
Horse odds greater than 10 up to a max of 23.
Stake size (as i am only trying this out for now as much as my account can take ,£2.5-10 so far)
Put in back bet at .50 to £1.5 profit.
My plan is to build up my bank until i can get roughly a £20 lay bet on a horse at these odds thus making the scalps much quicker.
I have logged all my results so far and have gone from £30 to £122.23 in just over 1 month
I used to put the trades on ,goto work and then look at the results when i came home but as im sure you can guess one hit and i lost £85 on one race.
Since then i have recovered so £131 - £85.32 and built back upto £122.23 with no deposits.
I now use the stop loss on bet angel trader (set to £10-£12.5)
Do any of you have experience of laying high odds horses and would it be possible to build my stakes to say £20 and higher?