Printrbot Simple 1401 Fan shroud with bypass extruder cooling

My extruder motor tends to run pretty hot even after adjusting the current as much as i can. so I added a heat sink to it and to make that heat sink more effective i designed this cowl (shroud if you like) that allows some air to blow up across the heat sink. When the fan is running at 100% with a stock shroud it seems like there is a lot of the air blowing back probably because the opening is so small it restricts the total air flow, so i thought we could use this excess flow and direct it up i