(I personally think it's a false objective to aim for winning days said:
Yes, i think with this system its probably best to view a day as a sort of hedged trade. All outcomes are possible. Most likely is a slightly +ve or slightly -ve outcome. A day when most parts win is great, a day when most parts loose is not so great but its just a single day or a single trade. After the week i just had i will be using a money management strategy that treats a day as a single trade. It may mean some parts are greater risk than others but it will mean i can capitalise on the actual points gained or lost rather than how many parts of the trade win or lose (which really isnt the correct way to look at it IMHO).
I do think targets are important though. In business you would use SMART targets with your plan to measure your success and keep you on track. If trading is a business then you need to use targets also. I think weekly targets are pobably OK, its just a case of finding a realistic level to set the targets (this could also stop you giving back profits on the Thursday, Friday).