When you said the flash meter display EV9 there is some problem with that. I don't know if other meters like the Sekonic would take into account of the shutter speed when it displays
the EV number or not. I use only Minolta meter and with the flashmeter III when set to EV display mode it display the EV number from f/1.0. So if it displays EV9 it means f/22 regardless of the shutter speed. On the flashmeter VI it switches back to aperture display even if you set the meter on EV display mode when you measure flash.