You may have identified the problem area by your selections: Why the two 1000m races [1 and 4 ]?
Trouble with these races is that you can often loose your money at the barrier and R4 is full of runners with no form at all. I would be dropping these two races and spreading my money on the other three selections. Regardless what happens today that stratergy [dropping 1000m races] will improve your return.

If you check your records you will find a loss on 1000m races overall and a definate loss on races containing runners with no form whatsoever [I will pass by a race with even 1 runner with no form] as you just can't figure what surprises may be lurking in them. Why bother ?

Cheers and may the form be with you.