Kinda figured it out. I went into launchbox and in each platform clicked image group and select the type I wanted, then switched to bigbox from launchbox and it has the different platforms as what I had it set to. But when I switch back to launchbox the platforms are showing the default image type but bigbox still retains what it was previously set to. So that works for what I was wanting. Thank you.
Edit: Though this doesnt not appear to be working for the playlists created under arcade.