When use termite to open neovim does not take up the full size of a terminal window (sometimes good, sometimes bad)

[og900aero]

I would like to be able to open neovim either from rofi or from vifm (CLI file manager). I'm using bspwm and termite. So essentially I need to do something like:

termite -e "nvim -S /home/shyciii/.config/nvim/vim_session.vim"

When I do this the neovim window (almost always) only only takes up a small space (80x24) inside the terminal window.
I think termite is badly, because works well with st (simple terminel suckless.org)

[og900aero]

I close it in the absence of attention