The only difference exporting your private keys will make is that it might (depending on the wallet that you import the keys into) give you a bit more control over exactly how you structure your transactions and how much of a fee you choose to pay.

Unfortunately, it won't change the fact that every one of those payments you received will require 148 bytes when you want to spend them, and if you choose to pay too low of a fee, your transaction will take a VERY long time to confirm.

There is currently a transaction accelerator at viabtc.com, so with some careful structuring and patience, while viabtc.com continues to offer the service, you might be able to consolidate your bitcoins into fewer future inputs at a cost of only 0.00000010 BTC per byte.