Thank you so much. I'll keep an eye on it.
I'm not heavier rider as I exercise fairly often. I'm 80kg and my bike is L size so it should easily cover that weight. I put the friction paste on the seatpost but if I have it in the room and the first time i sit on it sometimes it does this crack noise but it doesn't do it when riding it. I think its the carbon fibre 'give', no? I'll keep monitoring and will see if it gets worse. Thank you for your input guys