Looks like their system is confusing community names with emails.

You need to search instance on which community was created and copy-paste it's full name (i.e @[email protected]) into search on your instance.

Lemmygrad is blocked on all instances i have acc on this is 4 and growing.

Most instances publish their blocklists. Admins would be very angry if i would send a crawler to get lists of federated and blocked instances? It wouldn't load single instance too much. Just two files.

My laptop almost meets minimum, except i have Linux not windows and would need to clean my disk up.

Dunno. Im not much into gaming.

Only if i would some way to get around DirectX12 problems. Any tips?

May i suggest "lemmymen". It sounds cool to me.