I use the upturned lid from my 50 l. BM to sparge, remove the knob first. I have a copper flue device as supplied with my BM, so the lid is pretty much useless.
I use a whirlfoc tablet 5 minutes before flameout/end of boil. I have an immersion chiller recirculating the water from my undergound water tank, and whirl the wort with a huge chef whisk, but i am not much concerned with trub entering my plastic conical fermenter. I have not had any off flavours. I completed a beer tasting course at TAFE so I have a rough idea what is an off flavour.
I also am of the opinion that the wort should be left to rest for 20 - 30 minutes after flameout and whirlpooling, and the trub allowed to drop into the centre, and then I dribble the wort into my fermenter, don't rush this step. I find that more trub than you want will stay with the wort if you open up the BM tap and let 'er rip, so to speak. I feel that it is better to leave as much trub as poosible in the BM, I made up a hinged platform ( I needed the extra height for my fermenter to go under the tap) and worked out a way of lifing the platform and wedging it at the "correct" angle for maximum wort to flow into the fermenter and leave the trub behind. Anyway, this works for me, others have tried different approaches, You will need to go back and sift through these notes.
Cheers