Does bosses up your chances of getting one?
Yes, but according to TopDoc's analysis, the extra chance does not make up for the extra time it takes to kill them.
Does run at -1/x8 increase your chances?
Chance of purple drop is the same at level 49 as it is at 54, so the faster killing will result in more purples per hour.
Is there a way to get em faster?
Other than running -1/x8, not that I know of.
That blue thing running around saying "Cookies are sometimes food" is Praetorian Cookie Monster!
Shoot on sight, please.
The only downside to running at -1 is that most other drops will be Level 49 Recipes, and they won't vendor for as much as Level 50s. If you don't care about that, then by all means, go for -1, and NPC the 49s.
Also, this question has been asked a lot over in Player Questions, which is the best place to ask these questions. 
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Personally I found when I was running -1/x8 I got no purples. But when I kicked it up to +2/x6 I got two in one mob, three in one run, and seven in one week. Prolly skewed statistics but it kept me hitting them at higher levels. More cash too; I was netting according to HeroStats 4 million inf/hour.
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Hmm.. Ill keep running my farm at +2/x6 then..
I figured Id ask here before anywhere else..
Getting purple recipes..
Does bosses up your chances of getting one?
Does run at -1/x8 increase your chances?
Is there a way to get em faster?
I ask because I wanna make my blasters build cheaper then 4bil.. >_<
So if there is a way please.. PLEASE tell me..