The proper tool designed for this is a pull tool. That crap from home Depot doesn't cut it for really banging on. I got mine from Tarkett but see they don't sell it anymore. This one is from Sinclair.
http://www.tools4flooring.com/sinclair- ... p-341.html
You might try using a different board. Also, carefully examine the tongue of the board you're trying to install to. It could be damaged. Take a small piece of the flooring with the groove in it and go down the tongue of the last installed board. Does it fit everywhere? If not, there is something holding it back. Once you've determined the t&g are in good shape, the dry fit the last board. You don't need to bang it home but just ensure it will go together before you glue it up. You'll probably need to carefully scrape any dried glue off the tongue before having at it again. It will go together if the tongues and grooves aren't damaged and you hit the pull bar hard enough. You think coastal woodlands is a hassle. The old Harris-Tarkett longstrip; you had to beat the s**t out of it to get it together. One last thing. Too much glue in the groove will make it difficult as well. Make sure you are not over gluing. Good luck.