Grid Trading EA Modification

Hi there,
I have a very simple EA for Grid Trading, it opens Buy & Sell orders when the price hits the grid level, then it will close the loosing orders and keep the profitable ones running for each grid level.

The problem is the EA opens many orders every time the price touches the same grid level. I just want to modify it a little to be like the following:

1- Open only single trade (Buy & Sell) for each grid line.

2- If the price goes from Grid Level 1 to Grid Level 2 for example, the EA will close the loosing trade and open (Buy & Sell) on Grid Level 2.

3- If the price returned back from Grid Level 2 to Grid Level 1, the EA will only open the position which was closed before.

4- Step 1 to 3 will be rebeated every Grir Level.

3- EA will close all open orders when Account Equity reaches above the Account Balance by some percent (to be an external variable).

All the other external variables in the source file to remain the same. At the end of the job, (.mq4) file is required not (.ex4) If you are interested in doing this please contact me.