Meh, maybe you're just used to the feel of it from using it so long.
I'm pretty knowledgeable (computer savvy) so I know it's nothing on my end. I run with V-sync off always for every game I play. I also run on a BenQ 144hz monitor refresh rate 1ms response, as smooth as possible, paired with a i7-4790k, Nvidia GTX 970 and 16gb RAM so it's not my PC man lol.
I'm glad you enjoy it, I just simply didn't. Tried and tested and no Bueno for me. A $70 keyboard shouldn't have key lock anyways
it's a great keyboard for typing but I wasn't satisfied with its performance in games, as I said, I liked one thing about it, the scissor switches, the F keys are way to tiny and the enter key.
Both TOMT and sock have used the k740 as well and both disliked it. TOMT has told me the same thing that I am stating about the input lag, even ask him mate, lol.
I'm not arguing over a keyboard tho, you like the k740, that's all that matters. it's not for everyone