Don't know about a correlation per se but you may be onto something. I'm not 100% sure but I bet those lobsters probably eat and poop lots for their size.
You should give this a try:
http://www.tailoredaquatics.com/index.html?a=0&d=63
Follow the instructions, your nitrates will disappear very quickly. The instructions have you ramp up the dose intially then eventually you wean the tank off it. However I continue to use it anyhow with just a wee little bit (maybe half capfull) in a 115g and it maintains NO3 <1.0ppm.