Did you pull a cap off and verify you got reds and not blacks? Just curious.
first thing i did yeah, i do have a black QFR, so i know the difference

Part of the feeling may come from the sound. Try to type with headphones on your hears and tell us if it makes a difference.
i always type with my headphones on, because i use them 100% of the time while being home. yes the sound is definitely different, but so is the typing feel for some odd reason
how old is the fullsize? new switches in your TKL still need to be broken in.
this may be the case, the full size is a couple of months old. i'm not a heavy typist though, mostly gaming, so i doubt i was giving the full size a run for its money, typing wise.
as hyde said, the most probable cause is the different size of the steel plate, resulting in different resonations when bottoming out the keys (which i do), i think that causes the different feeling....it's way nicer than the full size one though
