Oh, I can truly relate to this, i lack concentration really badly and tend to ‘wander’ off, ie im talking out loud saying the rosary and my mind wonders onto other things, its very hard for me to control, but I pray to God to help me with this.
If I find that i have wandered off to far, I just repeat the Hail Mary once again and try to concentrate on it.
I would have trouble reflecting the mysteries at the same time, but then again, maybe thats why my mind wanders off, im not thinking about the mysteries… hmmm, just typing this has answered my question… I think…

Well Ill pray to you that you may able to combine the mysteries and the rosary together.
Take care and all the best
Dolph