Joining SuperBulky weight 6 together without major lump

I am working with Lion Brand Mandal Thick and Quick. A super bulky 6 weight tarn. How should I join one ball to another without a major lump in the sweater?

This way of splitting the plies works well. I keep the tails a bit long then weave them in the back of sts for a short distance.

Another way to do it is to untwist the yarn and then comb away about half of the weight. It will be more away in the tip and less higher up. Then put both ends over each other and felt them together with a bit of water by rubbing your hands. This of course requires a yarn that can be felted. I do not know your yarn.