Sorry, didn't catch this before.
For reversing in the rain at night I will usually pull the ebrake, get out, and scope out my path, noticing cues around me (Reflectors, porch lights, rock walls and poles) then I'll get in and do my best to see where I'm going. Because seriously, you can't see a goddam thing at night in the rain. When you're on the road though, it's fine. You can see headlights, their reflections on the pavement and you can tell distances quite well. I pay close attention to my side mirrors and back up very carefully.
For the side windows, no problem. I don't think 25% is dark enough, honestly. From inside the car during the day, there is NO difference between the 5% and the 23%. (I mean, there IS but it's not noticeable). With straked glass, the more straked it is, the harder it will be to see out of it. For a CRX, for instance, even 25% will be opaque. You will see fine out of the lower window, but the top will be unusable. That flat back window affords me more vision than you may think.
If you have a hatch do NOT I repeat do NOT attempt the tint yourself. You're only setting yourself up for an upset. And especially the ED rear glass. It's concave both ways and impossible to get bubbles out of.
Oh, and I have a 5% strip across the front window. I may do the tint again because I'm starting to get some breakage on the film (It looks speckled). I also never use glass cleaner on the inside. I use soapy water and a squeegee. I clean the outside with glass cleaner foam and a razor blade. Keeping up with that routine, I've lost a little potency in the tint (On a bright day, you used to not be able to see through any glass... as if it was painted over on the inside) but now you can make out silhouettes.
Next time I'm going to experiment with mirrored tint and black tint. With a light protection limo set down, I'm going to them lay over the mirrored tint. The result: Not mirrored, but you will NEVER be able to see inside the car, and from the inside the tint will be insignificant.
That's a tip from your Uncle Cel.