I would suggest you split up your firepower into 3 parts and trigger each buy at key points in the day.......such as a 40k buy at open, a 40k buy when others need help pushing over a hump, and finally a 40k buy just before close to guarantee a green close. This has been my strategy of late and it seems to be effective. Only difference is that i use about 4 different buying sessions utilizing 50k to 100k a piece.