A Tyre Question - 80 series automatic

For some time the outside of my rear tyres wear down and whilst the inner side has lots of thread I need to get 2 new ones .

The new ones go on the front and the front are switched to back.

Discussed with a friend and he suggested I go to a suspension specialist which I did .

He suggested a "Cast-O-Line Bearing kit" to fix the problem, but these can only be fitted to front.

After discussion I showed him the wheel alignment recordings and the ones he picked up on were "Rear Axle toe" which showed the following for "Rear Axle TOE"

9/9/2003 Left -0.3mm
Right +7mm
6/1/2004 Left -1.8mm
Right +13.6
1/9/2004 Left -.5mm
Right +10.5mm
6/1/2005 Left +3.8mm
Right +14.8mm
21/4/2005 Left -4.9mm
Right + 3.6mm
10/5/2005 Left -1.1 mm
Right +1.5mm

Had 2 new Bridgstone put on front at Karumba, with no wheel alignment , and shifted the Michelin Syndcrome to rear.
Did not get a wheel alignment when i got home.
These Michelins are now badly worn on outside after 39000 km (20000 since Karumba) but the inner side has heaps thread left while the front ones are wearing well all round(20000kms)

The suspension guy said there was something wrong with the Toe readings from prior to and from 6/1/05.
At latest readings it is at normal levels and he said they would need to check readings after the wheel alignment with new tyres.
I have not had any prangs but bought the cruiser second hand (150000kms ago) so don't know its prior history.
Tyres range from 25000km to the present 39000km which I am told is not the best.

Being a novice in this area I am at their mercy.
Will the Cast o line bearing help my problem with tyres wearing at back.

Is there any other thing I should get them to check so far as rear of vehicle is concerned?
Thanks
Pedro