Don't top it, whatever you do! Autos do NOT like to be topped or have any major stress inflicted on them! They don't have time to recover from it. I'd wait a bit to do the LST ... you want to see some stretch between the nodes - and then, if you don't want to bend them over, you could do something as simple as tucking the large fan leaves under and behind.
Looks like it's going to be a very nice grow - certainly looks good so far! Good luck!