This is how I calculate and it seems to be right all the time
Your example:
(Kaitse) 29,8 + 18,8 (Runne) + 22,2 (Fuusiline je vaimne) = 70,8 (75 is 5*)
75 - 70,8 = 4,2 > 4,2/0,2 = 21 . Therefore your player needs 21SKP until he reaches Q25 and becomes a 5* player. And another 75SKP until he reaches 6* (scout lvl)