That could be quite good news to me, actually. I carry 2 GL rivers. A 167 beat to hold a turn to the ground when thrown flat and a 172 that's the straightest fairway I've ever thrown.
I love 'em. They're so comfy in the hand and just fly so well so easily. I do wish that I had a more overstable compliment to the two that I carry, though. Then I could carry fewer molds, but still cover those shots that require a bit more stability than what I'm throwing.
I use a seasoned teebird for those shots now, that need to be straight and finish with some left low speed fade. It seems like I have to throw it a lot harder to get it out to where why Rivers would normally just glide out to with a smooth easy toss. The rims on the River just seems to fit my hand just right, with a little + style, but not as severe as the angle on Innovas + molds. They just come out clean. I may have to pick up a couple of heavier Optos and see if they fit the bill. If they fly like a seasoned Teebird out of the box, then winner, winner for sure.