Ollie,
Philip put a couple of good links. A better one than the first is this particular thread as I talk expressly about SCT's and Maks:
SCT & Mak total dew control without heat - a solution!
This link follows on directly with the second one that Philip posted
As for red dot finders, I LOVE them. Some are better than others, and it can take a little getting used to. I tend to use both eyes with them.
I do have and use both optical finders and rdf's. On my big dob when I am at a dark site I use both on the scope, the rdf to do a rough scope placement, and often it is enough, and use the 50mm optical finder for fine tuning when chasing difficult targets. Often the rdf is enough to put the target in the eyepiece, including faint fuzzies.
From home, because of my experience, I am comfortable just using an rdf - I'm not chasing faint galaxies from home. And when I'm aligning my goto systems, I only use the rdf to help locate the alignment stars, and then I'm not using any finder from then on.
With your Evo, you really only need it to help acquire the alignment stars. However, if you are really struggling, a straight through optical finder may be an option. Or both! There are double finder adapters available, even triple finder adapters.
Polarizing filters are great if when you are doing low power observing of the Moon. The Moon can be exceedingly bright in its fuller phases, and a pair of polarizing filters can be a huge help. I also have a set of these, and use them with my 8" scopes only when doing low power work. When using high magnification, no filter. Along the terminator you really don't need a filter.
Also, when observing the Moon, don't bother going to the same extent of using a red light and keeping your surrounds pitch black. There is nothing subtle about the Moon, and it is better and safer for you to keep the porch light on and a white light headlamp as your vision will not be dark adapted with the Moon. Instead, your vision will be stunned, like when going from bright sunlight into a dimly lit room. A dim red light and dark surrounds is not a good combo with the Moon. Again, this is from spending hundreds of hours sketching the Moon,