33% cart abandon is nasty but keep in mind industry average (depending on source) is 25 - 30%. I know marketingexperiments has some articles on reducing the abandon rate but you could try and capture their name and email before paypal so you can follow up if they don't complete the purchase.

hello

i have just been on your site and had a think about your problem.

i personally do not like paypal, as it is just extra fuss, as a result i dont know much about it.
there is no indication that paypal is the method of payment, and when i got to the cart screen i would have given up. If you could intergrate it so that you had your own shopping cart, and then a link that went to the second page of the paypal bit i would have bought from the website (in theory).