I use a .8 mm nozzle all the time on my E5+ , I usually get away with printing at 40mm/s with stock heater and I usually go 5 degrees hotter than usual for optimum flow. Nozzle- Micro Swiss MK8 Plated A2 Tool Steel Wear Resistant Nozzle (MakerBot, CraftBot, Creality, CR10, Ender 3, Ender 5, Tevo Tornado) .8mm https://www.amazon.com/dp/B07P9Z668Q/ref=cm_sw_r_cp_api_glt_fabc_31FJK7AANTRHHNCDC8H3