Humm... the tocing sound does not sound good at all. Can your PS2 still boot orignal DVD games?
You should really take good care of your laser for now as the tocing sound might indicate the life of your ps2 laser is going to end.
Reduce playing load excessive CDR games (e.g. GTA) will help.
I hope it is the DVDR that you have is having the problem instead of your laser.
I don't burn DVDR games myself but there is good a tour here:
http://www.fileforums.com/showthread.php?threadid=43792
Also I head people using purple bottom Retik DVDR works.