Accept that each session is random
2 or more scatter symbols landing on reels 1 and 5 at the same time trigger the Re-spin Feature. How often that happens is not known in advance. The result of one session is random, whatever the RTP says about the long run.
1 RTP version is listed for Dr Feelgood, and the game rules show which one runs in the Johnnykash lobby. Read those rules before you play. An RTP figure describes returns over a very long run, not the outcome of one session.
A$50 is the highest bet this lobby allows, and the maximum win sits at a ceiling reached very rarely. Very high volatility means wins arrive in large gaps, so a session can end without a large win. Nobody can know in advance whether a session will reach that ceiling.