Generally agree, but "Final Act" is definitely Sakuraba.
"As Time goes on" and "Harvest Festival" should be the same composer as it's a dynamic track containing both in the game (similar to "Euclid" with "Lonely Twilight"), leaning to Tamura. "Sylph" and "Triumph" sound like Tamura to me. "Lake on Ymir" and "Open Fire" rather complex time signature changes are more like Sakuraba. "Perverse Religion" should rather be credited to Bach (Little Fugue in G Minor, BWV 578). For "Credits" (which was removed after the SFC version) I wonder if it that may be by Ryota Furuya (possibly more tracks like all the jingles)...