For the Oalf game i would not buy thorn mail unless you have 3 other AR items. The damage back scales with bonus AR for the damage. Try dead mans instead for AR health and movement speed. When you ULT you will be immune to slows so you might get on top of propriety targets easier.
Try to figure out why you are dying so much and try to adjust your style. 8+ deaths is bad no matter what, any advantages you had are being thrown away.
For wards you need to pick up some pinks. Also the thing about warding is that it is not always the number but where you ward that matters. If you ward 99 times in a game but always defensively you are not making it so you can press an advantage. Instead of worrying about the number (though pinks at 0 is bad) worry more about how you are warding. Are your wards deep enough that you can see the enemy coming when you are doing X objective.
Only so much information can be seen from a post game report.