Trimed mine with a dermal but a hack saw would have been better as the dermal melted it rather than cut it. So then needed to go over it to clean it up.
I didn't trim mine a huge amount but I have seen others hack it back a long way.
2 words or caution, 1 you need a reflector so do as I did and leave the old one in place on its tab or as others do and stick a stick on one on the plate itself.
2 even cut back a little and you get a LOT more spray up the back. I meen a LOT :P
Will try to find a pic of it.