If the LTS (4.9) kernel with it's modules is working well, why not make that the standard kernel you're booting into? At least until the current kernel is fixed. This is not just a Solus issue.
Of course, another solution is to use alternate wifi hardware such as the Panda devices: http://www.pandawireless.com/
Seeing how often Broadcom presents issues in Linux and Unix, it makes sense to have a good backup wireless system - - plus the cost is only about 10-12 usd on Amazon for the nano sized usb ultra 150 n . . . fast enough and very reliable.