Yeah this episode has brought me back to basics. after too much reading and not enough doing. I think i've been too concerned with the LSN and I have been taking the HSN for granted. Been told it does not affect the Idle tune but i'm not convinced. I've just been leaving the HSN set at around 4 or bit less but not actually tuning the top end properly and doing the WOT runs and leaning the HSN to optimal. It's still producing top end power but probably not it's optimal. Hard to tell still goes pretty hard. I think I'll be resorting to basics first thing at the track tomorrow and lean that HSN needle out to optimal first and then finesse the LSN. The club guru has said he will have a look at it for me but that does not improve my tuning ability. I do beleive the HSN set to rich has to have a direct affect to the LSN and idle. It moderates the amount of fuel on hand for the LSN to govern.