I have fixed several gyno flare ups with nolva. The lump has gone from big, hard and painful (ever banged your gyno with a dumbbell? Ouch!), to only noticeable if I press on it very hard (so practically invisible/unnoticeable).
I've had gyno a million times (super prone to it and cycled like an idiot in my younger days) and nolva works a treat every time. I know not everyone's gyno seems to react to treatment but I'm lucky in that my gyno goes away just as easily it seems to come on.
I have used letro in the past and it's worked but made me feel like shit. A combo of nolva and aromasin is much gentler. Raloxifene has worked too but I felt like it took longer to do so than nolva.
Generally speaking, a large, painful gyno lump will be gone in 6-8 weeks on 40mg of nolva. I don't even give a shit really when I get gyno now because I know good ole nolva'll sort me out (although obviously I understand high E is bad due to other reasons so I take that shit seriously).
I know this is very much an n=1 situation but I can say without any shadow of a doubt that nolva kicks my gyno's ass and I love it. The scientific literature is all there supporting it too.
So yeah. Nolva, baby.