Finally reached 4MH/s again on AWS after the screwup causing massive stales (was getting 4.5MH/s before, but each batch of hashes were taking too long, causing the work to be stale by the time the GPU had completed it too often.) Also reached 4.5MH/s per stock 750Ti. Screenshot for AWS shows CPU + GPU speeds, CPU being around 300kh/s or so. Screenshot for the 750Ti cards shows a higher hashrate at the pool, no doubt caused by luck.
I modified the CPU sources a bit and I'm getting over 400Kh/s on g2.2 with 6 cores.