This is my sigg just 1 thing.. the way the mouse moves from clicking high alch to the item feels a bit un-human like to me if you know what I mean.
And if I seen this correctly it seems as if it clicks a certain way for 8-15 times and then repeats a certain pattern.
anyhow nice bot though! as you can see I already did a lot of alchs and I haven't been banned yet. I think this is also due to the fact I didn't do 6 hours straigth but 1-2 hours at a time.
most people who alch just keep their mouse on the same place and don't really move it all to much.
instead as anti ban you could perhaps make the camera turn randomly, and randomize clicking intervals this will lower xp p/h but also decrease ban probability.