Hi, we have just purchased and installed the Mimosa 3m x 3m pergola. Required specifically for shade around a small pool we have in our back garden. However, the issue we now face is that due to the height of the pergola, once the afternoon sun (around 4.00pm) hits the pergola, no more shade. Is there any form of attachment we can instal such as shade cloth or even side louvres to increase the amount of shade. Something we can roll up and down as I am aware that we must leave the top open and potentially the sides if anything is installed.