i dont know much about the trnslator, arent there diffrent settings on that.i had this problem a while ago when i added a cold air intake.could be a bad connection in youre intake pipes before the maf.do a search on high blms and you will find information on the translator settings. i remember seeing a lot of posts on that.someone else will probably chime in here.
I had high blm's (150+ @ idle)found that I didn't have a gasket between throttle body & plenum also the vaccum block(on top of plenum)was leaking,fixed both of them & blms went down to 126-128. The translator is set @base=10% rich, wot=12%rich
I wouldn't get too concerned about it. As long as the BLM has not hit its upper limit (probably 150 or 160), the fuel mixture is exactly correct (as long as the O2 sensor is right). Its still under the ECM's control.
You made it worse by leaning it out when you changed the trans settings. High BLMs means its lean not rich. Go back to your previous settings, maybe slightly richer and see how it goes. TurboBob is the man with the Translator if you have any q's
I dunno if having the egr blocked off can cuase a blm problem at cruise. And my understanding is there is code thats done to the chips when the egr is blocked off.. Since your idle BLM's are there.. my hunch is egr/chip.
BTW.. HAPPY NEW YEAR
I can swap out the MAF for a stock one and run a regular chip and see what happens? This would isolate a lot. Just a thought.