Margo,
If you are having problems with the Crayford focuser in changing eyepieces then I could swap you for my rack and pinion, it works perfectly
It takes a bit of time and practice to change the higher powers without moving the scope too much. Just give yourself some time and enjoy.
If you are having problems with the OTA balance with your range of eyepieces that would suggest that the spring tension system is not set properly and needs checking. On my 8" scope I only use one spring and that handles all my eyepieces so I would be surprised if you need magnets for this range of eyepieces.
Cheers