Sounds good. I'll be running a streamed lobby tomorrow, Wednesday 26th, starting at 3PM BST UK time. Would be a good test to have you try it out. I'm wondering if the SSD will help. If we find the answer we can help base PS4 and PS4 pro players lag issues for sureAh, sorry I haven't tested that. I have hosted a lobby that included PS5 players but not the other way around.
Edit: If you want to invite me to your lobby, we could test it. I'll message you