" flawless glide open with absolutely no play in the blade at all."
bro, i don't really understand this kind of statement, NEVER.... they guys often mention it, but i had a number of bm's, and ALL of them had pivot play. and i saw many other people having such problem, maybe there is some weird luck like your case that you managed to get three pieces of ONE model(!!!) without a blade play. i saw very few production knives pieces that matched this measure, were not benchmade anyway. other pieces of that models were just usual. if you tighten it - it will be stiff before the play is eliminated. you can polish the washers but it voids the warnty, so no way. it doesn't bother me anyway))) it cuts well, opens, and i never use it for fish, so no problems. are they new ones anyway? what is the date of production?