Duck diving trouble

As most of ya probs know from my last subject, I just recieved a crappy 73' foam board which slips like hell, givin me trouble to paddle and even more for foot grip durin pop ups. Now I have new trouble. The surfboard is too light and floats easily that itz costing me time just trying to put all my weight to get the damn board underwater before the waves washd me ashore (Happened too many times to me yesterday). Is there anything I can do to improve my duck diving with the damn board?
Thanx.
Below is a pic of my foam board, only mine never came with tht decker (If thtz wot itz called, still a beginner lol)

Thanx.
Below is a pic of my foam board, only mine never came with tht decker (If thtz wot itz called, still a beginner lol)
