80mm/s is pretty slow for an i3. Certainly with an 0.8mm nozzle.

I do find it weird that people print things so slowly. The I3 design (as prusa intended it - not as ender have crippled it) is perfect for fast printing.

when my dirt cheapo ctc was behaving it maxed out simplify 3d and was easily printing at 200mm/s.
The bog standard speed setting on my delta is 100mm/s. I only slow it down to 75 for neat and precision prints. For stuff that's just meant to be functional I always run it at 150.

The t-rex with the big nozzle and the hi-temp extruder is more than capable of running at similiar speeds.

WHAT FILAMENT ARE YOU USING AND WHAT PRINTING TEMPERATURES


Also your retraction settings are awful.
It's a direct drive extruder. So change the retraction length to 2mm and speed to 70mm/s.

Looking at the model pictures, you just don't have good adhesion for your first layer, the rest comes from that.

What speed and thickness are you printing the first layer at ?
And do you have anything on the bed to help with adhesion.

Does it have a bl touch or similiar ?

DETAIL IS NEEDED !