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What switches have you got in your Ducky? The SA keycaps, especially the sculptured ones, are very heavy, and work best on heavier switches, like MX blacks, greens or clears.
When used on lighter switches (blues, browns, reds) the keycaps are too heavy and almost make the switches feather light.
We used dumb terminals when I was at uni, and the best ones were the old ones with the noisy keyboards. I was more than happy to use them and let everyone else use the nice new shiny terminals with the quiet keyboards (with the keys that used to stick sometimes).