Any advice for a newcomer?

Howdy Cubasians! I’m new to the forum and have started recording in Elements 9.5 I recorded a song at 105 tempo with 17 channels of guitars, vocals and a drum track. Then I realized that the song would sound better at 110 tempo. I followed the advice on the net that I should use the Pool to mark all the tracks and then easily change to 110. Unfortunately, I get a gargling effect, so called artifacting, which is annoying. Is there a way to change the tempo without having to re-record all the tracks? Look forward to some pointers!