Thank you rakau!
Thank you simk. It is a Kreuzotter, Vipera berus, and yes they are around here too.
Thank you knoll, when it is braced it doesn't look balanced, fed looks better than.
Thank you leonwood, actually this is the bow I told you I was struggling to get the bottom limb to bend. It was already so thin I was concerned it will collapse. Hollowing out was the clue. And i hollowed it out too much, so my last scrapes tillering were on the upper. I also traced the reflex on paper. I checked yesterday - it is still the same.