Thank you all for your replies
Sorry for the late reply myself, I have been incredibly busy and even internet-less for a while!
Yes, I'm feeling that it's probably an issue of teenage testosterone! I've decided that they can stay in the split cage for a while, and I will start the process of trying to reintroduce in a few weeks (and will update just like before)! And I will most definitely place them in neutral ground with distractions when I reintroduce them in the future, who can resist a munch on something yummy!