When I have to check live RTP before playing slot games, I will not choose the game based on the RTP I see at the time I visit the live RTP page.
I will monitor it first for maybe like 10-15 minutes, to know the live RTP is increased or decreased.
In case the RTP is lower than the default RTP and it is increased within the 15 minutes or even an hour, I will play the game.
On the opposite side, if the RTP is higher than the default RTP but it is going down, I will not play it.