i tried ten meteors and nova with +7/+8 lycaon as same target
+7 lycaon staff
1134 - 1040
999- 1023
1192-1013
1024-962
1083-874
1167-872
1116-979
1104-870
1254-1088
1239-934
11312-9655 TOTAL
+8 LYCAON STAFF
1246-905
1038-924
1141-977
1248-887
1269-894
1090-930
1078-982
1158-993
1115-1054
1290-924
11673-9470 TOTAL
???
Don't you see the difference of +10 elemental damage ? 10 tries is not enough data to draw a conclusion but still you can clearly see that your min and max damage has been affected. And of course the overall damage varies thanks to the (awful in KO I must admit) RNG of the RPG's.