So here are a few that i've tested and played through. I think there might be one or two T3. But the rest are a mix of T1-T2.
SURF_DOJO
SURF_SODACITY
SURF_ANOOBIS
surf_deadline
surf_delight_go
surf_bananenfliege
surf_bonkers_v2
surf_sewertunnel ----- this is a new map i think
surf_believe_refix
surf_hearth_fix
surf_liopleurodon2
surf_ethereal
surf_nova
surf_premium --- i hate this last stage
surf_intothewild_csgo
surf_orthodox_fix
surf_rocco_v2
surf_scientist ----- this is a T3 map. Not super difficult.
Some may be new, some may be old. But for the most part i just think we need a few more maps into the rotation.