You need to actually be accurate with your bites to get full damage. Look at your own video. Your first hit was 50, followed by 25 and 25. Meaning you did a total of 100 damage. Not enough to kill a base marine. The damage a skulk can do per bite is 25,50 , and 75 if your are dead accurate. Here's a video explaining it a bit.
<!--quoteo(post=2062846:date=Jan 18 2013, 09:45 PM:name=Kouji_San)--><div class='quotetop'>QUOTE (Kouji_San @ Jan 18 2013, 09:45 PM) <a href="index.php?act=findpost&pid=2062846"><{POST_SNAPBACK}></a></div><div class='quotemain'><!--quotec-->Also what is up with the title and description of that video :P<!--QuoteEnd--></div><!--QuoteEEnd-->
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<a href="http://www.youtube.com/watch?v=fmBRGJd0xxs&list=PLAwy04eq2AQtn1Jsqfseg4b5u77oYwqaZ&index=3&t=1m59s" target="_blank">http://www.youtube.com/watch?v=fmBRGJd0xxs...x=3&t=1m59s</a>
lol it's the default that I forgot to change.
And thanks for the explanation YIM!