If not using a pump (I frequently do not - actually, I rarely recirc anymore, come to think of it), then consider frequent, gentle stirring of the mash (every 10-15 minutes after the first 10 minutes or so). I go with a 75-90 minute mash often, but that is just because I want to get a few extra points. Lastly, consider putting the power at 50%-66% level during the mash, so the heating is more gentle. I hold temps pretty rock solid in this manner, but, of course the time the heat runs is likely greater (if that matters to anyone). The only time I had issues with mash heat fluctuation was running the element at 240V at 100%.
There is nothing wrong with mash recirculation, though. With the pump already on hand, try it a few different ways and find what works best for you. My next step is considering insulation to wrap the unit in the upper chamber, keeping it above the heating/vents area. The double wall construction works well with temperature control, but in the cold of my garage, I think it will help with winter brewing a little bit.