I'm doing these next, same dimension grow area (although I have 6ft 6in height), same size light too. I'm going to top mine once. I ran Killing Fields last year (and didn't top them), they went quite tall -biggest was 4.5ft after being put into 12/12 at 1ft. From what I've read on Sannies open grow forum the Sugar Punch doesn't stretch as much as the Killing fields.
Don't really know what to suggest, it's your grow after all. But I reckon if you grow them to 1ft and then top them once, give them 5 days and flip them to 12/12 they will probably remain within your grow room height. I've seen Sannie use a technique where he hangs light fishing weights from the tops of his plants when they get too tall, can't find the thread on his forum right now though.