Perhaps performance can be improved bigtime by adding a convecion fan and
replacing the controller with a more reliable and useful thing.
OK so that should be good but the last time i checked hot air ovens are VERY high-power and VERY huge plus thousands of dollars for "smaller" ones
Nope, convection ovens for me. Getting one that is around 1800W and if i read correctly 4 heaters
3.5kW ... argh, need a 15amp plug