Decreasing in size

Hi, my name is Ian. I am 5'6-7 and 160 pounds. I am an intermediate longboarder (starting to noseride and big turns on a 9'0) and have only tried shortboarding a couple times. It seems fun but I have been unable to catch a wave. I like surfing at the malibu pier and leo carrillo when it is smaller (1-3 ft). It is somewhat mushy at leo and medium steep at the pier. I've been looking at used puddle jumpers and rusty muffin tops but I don't really know what to get. Does anyone have any suggestions for boards and/or sizes?
Thanks a bunch, Ian
Thanks a bunch, Ian