nubbinator's lube advice indeed turned out to be the solution to the pings, indeed they all ping, and quite differently too
Apart from this, I had a chance to test the 60g, 62g, 67g springs, without being too scientific, the 60g was the best for clears
I tested them in a gray tactile switch, the 67g one really tainted the bump, the 60g one was more mellow than the clear spring itself
They are all high coiled springs, unlike the low coiled but strong clear spring (the tactile gray spring is also high coiled, it also pings the most, compared to the others)
Like I said It's not a scientific test, but I like 60g springs the most, to put inside pcb-mount gray's to make them practical clears (the clears themselves are only available at electronics part sellers)