Hi Bobby,
Without seeing your swing this is quite difficult. If you have all the basics of the swing and you feel this is purely due to your weakened shoulders etc.........
I suggest you concentrate on hitting balls at the range with what in you mind feels like half a swing....If you can get someone to video your swing you may find that you don't overswing or you are way to far....the mind is teribble at judging the length of backswing, when I did mine I was shocked that what I thought was half a swing was actually a full swing....so I have been through this.
I think that perhaps you are worried that you are not strong enough and feel the need to exagerate the swing....Don't...the driving range is full of people using brawn instead of technic.
Your question regarding 3 wood and driver, I would suggest the most Tour Pros go past parallel on the back swing with these
clubs.....the important thing is they stay on plane.
Try the half swing drill you will be supprised how much power you have.
Hope this helps.
Ian.