I get the same results with too fresh and wet flower. I think I heard someone once talk about collecting the watery stuff and letting it evaporate off the moisture for a while, but that would take forever without heat so I never tried it. Supposedly the freezing helps, but it didn't for me, either. Just a watery mess after pressing.
Soooo...I always let mine dry and then even cure for a couple days before I'll start pressing some out to see how it does.
I believe some call the fresh freeze and then press "frosin" so might search around for that some on the web to see if you can find a working technique. If you see my old thread somewhere an AFN about it, don't bother...just more watery results.