Well, any time you combine aftermarket parts from different manufacturers, there's bound to be little glitches. If you need to shave the Firm Feel spacers a little to get them to play nice on the QA1 K frame, that's not out of the ordinary.
I have no idea what you mean by "scrape metal off for the top bolt".
Can't answer that, since you still didn't say whether you got LCAs with sway bar tabs or without.
If you don't have the tabs on your LCAs, then you need to use the supplied brackets. Without one or the other there is nothing to attach the sway bar ends to, rendering the sway bar totally useless.