Thanks for always replying quickly!
It might be my trackpad which is an issue. Just got in to the office and the trackpad here works fine but I wonder why BTT has anything to do with it. As soon as I quit BTT, the trackpad at home works fine. Here at the office, trackpad work fine while BTT is open
could "maximize on next monitor" shortcut be updated so it would also work with "integrate with native system resizing"?
Currently the "maximize" shortcut works as expected with the extra padding around it but "maximize on next monitor" does not 
Found the issue. It's an issue with Mac OS and refresh rates on external monitors. It's laggy as hell on 120hz so it has nothing to do with BTT
Since Sequoia install, SnapTool no longer functioning for me. Shortcuts not working and although I can see the outline of where a window will be resized when dragging it by its titlebar, when I release it doesn't snap into place. In OS settings, "Displays have separate spaces" and all tiling functions are turned off.
There might be a bug with the detection of "Displays have separate spaces". If this is off, change it manually to "Use Classic Mode":
That appears to have been it, many thanks!