I agree. When I gradually move down to it over winter and do a full 20 min test in the position it’s been slightly higher and more sustainable power but I suspect it will be down just now, hey ho 
Edit I was right my FTP is down 30w on my last test in mid July. I’ve also decided I’m ditching ERG and the Ramp Test. ERG put the resistance up at the start of a warm up before I even have a chance to pedal, aggravating my knee slightly. With no decent warm up to the ramp test I cant get in the zone and motivated, I’m only ever pushing to 91% Max HR, whereas on a 20min test I’m pushing to 96% and got 42w higher. The final ERG spiral of death further hurts my knee 