There's no reason to set CURL Proxy Status to true anymore. At all. Ever.
The logs you showed contain only the 2nd of the 3 stages of an Express Checkout transaction. There should be 3 PayPal_CURL_EC-xxxxxxx.log files for each transaction, and between 3 and 7 paypalwpp_Paypal_Action_EC-xxxxx.log files to go along with them. What you submitted simply confirms that the customer logged in to the PayPal side and was returned to your store and send to the checkout_shipping page.
I'll need to see the rest of the log files.
Additionally, since you're saying that the transaction shows as completed in your store, but doesn't show up in PayPal, it sounds like you're maybe looking at the wrong PayPal account. Either way, you should probably log a ticket with PayPal to ask *them* where the transaction ended up: www.paypal.com/mts
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