Hey Bobby,
I haven't really "chimed in" on the Weichs yet for a few reasons.
1.) I waited to put them on until after I had finished Patsy, so I've only been playing them a couple weeks.
2.) Against the (probably better) advice of some others (durub), I installed a mixed set straight out of the gate rather than trying the full set of EPW. I went with EP Weich E/A, Oliv D/G. So I can't really give any sort of informed opinion regarding the whole set. -And-
3.) Unlike so many others, I never tried the standard gauge EPs, I waited and went straight for the Weichs. So I can't really offer any personal comparisons of the two gauges.
All that having been said...
I LOVE 'EM! I was coming from Golden Spiral D/G, Spiro Mittel E/A and I was worried about the EPWs being too growly (for my taste, anyway) like Spiro weichs. Not the case. Less growl than even the Spiro Mittels I was using. As others have stated (ad infinitum), beautiful, big, warm fundamental to be sure. What I would consider to be a "dry" sounding string, though. Volume-wise, not getting the "brown note" volume that others have raved about but my bass definitely has more projection with the EPWs. They mix well with the Olivs, very consistent in tone and volume across the board. As you had advised me, the Oliv D is a little tubby, but nothing that I can't stand. The tension of the EPWs is the best part; a very playable, "buttery" feel. Nothing like the high tension of the EP standards that I've read about. In fact, the gut Oliv D/G are higher in tension (to my hands, anyway) than the EPWs! Completely the opposite of what I used to with Spiro/Spirals so that's taking a little getting used to. Great arco. The EPWs make even my ham-fisted bowing sound nice! Easy attack.
I came up with what I thought might be a good mixed set of Pirastro strings (EPW E/A, EP Standard D, Oliv G) and wrote to Pirastro for advice before purchasing them. Adrian wrote back and said he thought this would, indeed, be a good mixed set and they'd like to send me a "comp" trial set! I swear I was NOT trolling for free strings but I sure wasn't going to turn them down! So that was the set I received. I had it in my mind, though, that I really wanted to keep gut for both my D as well as my G, so I bought the Oliv D from Quinn. I intend to use this current set for a little while before trying out the EP standard D. And eventually, I want to purchase the EPW D/G just to give the full set a fair shake as durub had advised.
Don't know if that gives you any useful info on the EPWs but I'm very happy with them. I haven't tried a TON of different string like you and others here but, from my limited perspective, the Evahs are definitely a unique sounding string with characteristics that I haven't heard in other strings I've tried. I miss the overtones and growl of the Spiros a little, but the Evahs come pretty darn close to the sound in my head and I think I'll stick with them a while...
...unless I decide that I "need" to try the Chordas or Gamuts! LOL
-Brad