I've been personally discouraged with tabs written by those who claim to be professionals yet have it wrong. But good luck in your search. Also if there are vids on youtube of decent players giving a lesson on the Kansas pieces, it would be worth checking it out. You might have to plough through vids of un-professionals until you find a seasoned musician giving bass lessons on how to play the tune, but believe me it is worth it. You can also zoom through a bunch of Kansas live vids and you never know...there might be a camera spot on the bassist playing a specific part that you feel has been interpreted and played dead wrong even by the professional sounding instructors. You can play along with these vids, develop your ear, etc.
This happened to me long ago....I was learning Emerson's Tarkus on electric guitar and adding in the accents of his left hand. I was having a problem with a particular section, but knew if I could see him play it live..it would make more sense to me. And it works...so try it with the vids. good luck.