I feel like OP needs to invest in a new OS, graphics card, or something of that nature. I've used FG-X, Trigger, and VCC
on virtually every session for close to a year on dual monitors with not a single problem. I understand the frustrations, but if you want to use Slate products, it may not be a bad idea to explore other options surrounding the problem. It may help your headaches. Just my $0.02.