Bummer.
Lots of casino's do not offer the highest RTP setting of games.
Also this does not only apply to games of Playngo, but goes for several other game providers.
Some of these game providers are: Netent, Thunderkick, NolimitCity and Pragmatic.
(I don't want to quote someone elses list posted on an other forum)
Also I think that generally RTPs of newer games are slightly lower than games of a few years ago.
Going maybe from 97%-96% to 95%-94%.
Oh well, RTP is not everything.
That said, if you want to get the most ''bang for your buck" you might want to try the handful of games on Unibet (maybe other casino's as well) that run at 98%.
Also if you do mind RTPs of slots much, always check RTP before playing or play the providers that only have 1 RTP setting.
Casumo is a very good outfit.
Too bad I have not had much luck on the slots there, else I would play there much more often.