I have the evo 46. and 10 years of nitro engine racing ,and repair experiance.
We have about 11 of these evo engines at our club, EVERYONE, of them has had the few tings in cmmon
1. they make ALOT LOT of very thick dark gooey exhaust for a while.
2. They all had to have the pin in the high speed needle removed so that for cold weather or real hot weather, they needed morerange of adjustment, but only about 5-6 clicks past the orriginal stop point.
3. we removed the baffles from most of them to only replace them right away because these engines are much more sensitive to fuel pressure than most engines,.... one would run OK, the rest leaned out alot and died immidiatly, and none of them ran any better, ALL ran worse.

SO i do not recomend removing that baffle, it wont help, not on this engine, and realisticlly, for more power via exhaust, do it right and get a tuned pipe if you gonna mess with it.

my suggestion is try larger fuel line first, if not larger, just replace it andalso check that the holes are VISIBLY clear.
I would try that, if it dont work try removing the stop pin on the high speed needle with a pair of needle nose, but only if you need to go farther and are currently running into the stop.

Seriously try the line first, It may not be a situation of a blockage but a leak?
The best way to see if the pressure is flowing in run it on the plane standing still at wide open, ON ALL of our evos the oil is in that line alot more than that of most engines, but it does visibly move thru that line while running. If it isnt moving that oil or is slows down as it runs then stops as it dies, it may just be a temperature thing. 20* is pretty cold, but i fly in 25-35 so... i dunno. Hope i helped. M