Ive had this problem with the CLAM bootstrap aswell... the client is not recognizing the bootstrap. If it was, the client would take a long time to load, with a message like verifying blocks or something like that. From the screenshot I can tell its just syncing with the network like no bootstrap has been used.
See how it says "importing blocks" in the lower left? That means it's loading blocks from the bootstrap.dat file.
You're wrong about it syncing from the network. To prove it to yourself try switching off your cable router or otherwise going offline and see how it continues making progress.
If you just want to claim your clams, checkout the just-dice digging function. Worked faster for me!
Yeah, whoever made that site is a fricken genius.
There's also clamchecker.com. They have fee of 24%; for every 4.6 CLAM you claim you get 3.5 CLAM, they get 1.0 CLAM and the affiliate gets 0.1 CLAM. On Just-Dice for every 4.6 CLAM you claim you get 4.6 CLAM. The site takes off 0.001 CLAM for the transaction fee and you get the rest.