All explorers and similar shapes from other brands has that balancing problem ... I don't think that repositioning the strap button is a good idea , you'll just get used to it in a while.
There are lots of guys , famous or not , who play explorers exclusively ... The thing is that they just get used to it .
Some people play V shapes only too , and they're even comfortable when they play in sitting position .

If you like the guitar , get it.