This works for me.
Think of it now as dead money ...
... it's gone, committed, you no longer have it.
Don'e agonize any more about whether or not to invest it. Just visualize your finances as if that money was not part of them.
So on Wednesday, if you decide to go ahead, you are playing with money that is not a part of your critical financial base. It's almost like using someone alse's money.
If you make a stack, it's a bonus. If it doesn't work out, you don't have to feel too bad, because the money was mentally already written out of your own finances.