15% summoner spell cooldown reduction from 'insight' mastery plus 10% reduction from lucidity boot plus the ghost, tp, flash enhancement still put my flash on a cooldown of 217 seconds. Is this correct? and when i switch my lucidity boot enhancement to others, the cooldown goes back to 255. Is this correct?
This is not correct. I actually ran some tests a minute ago and found that, if nothing else, they all have an effect. It's not consistent, however. It seems that Summoner's Insight and Boots of Lucidity stack additively together (That is, having both will give you 25% reduction), but Distortion stacks multiplicative; thus, having all three gives you 36.25% cdr, bringing flash down to 191.25 seconds, rather than if they were additive, which would give you 40% cdr and a 180 second flash. This works no matter which ones you have - boots and mastery happen together, but distortion reduces the already-reduced version. So, you get slightly less bang for your buck in terms of cdr from distortion if you have the other two - but, since distortion also improves those spells, your other cooldown becomes more useful, so it probably somewhat evens out. That all seems fair to me.
