High ping with an increase in bandwidth powerline adaptor
I have recently purchased AV1300 powerline adaptors to replace of AV600 powerline adaptors. While I am totally aware of the fact that an increase in bandwidth would not decrease the ping, what I didn't expect is that the ping would be come extremely unstable. With the AV600 powerline adapters, my internet ping rests nicely at ~13ms, with the very occasional high spike. Exchanging these adaptors to AV1300s led to pings ranging from 13ms (rarely) to 600ms, mostly hovering around 100-200ms. Has anybody else experienced this? Can anybody advise me on how to mitigate this problem? I am currently switched back to the AV600s, but I'd rather not have wasted my money.
My router is an Archer VR600v, which is also a bit flaky, as a new device connecting can often cause the DSL link to drop. Given that the AV600s display consistently low pings, I doubt this is the problem.