The Southsea Setup

Hi Doctor J! Thanks for the speedy reply! So I took your advice on board and gave the neck some slight relief to the point that the strings weren't rattling any more (no rattles anywhere up or down the fret-board, open string or otherwise). I then intonated the bridge again and did the test of pressing down on the first and last fret and checked the 8th and 9th fret and can confirm I've got the gap to just less than the width of a business card. So far so good! However, the action still seems utterly rubbish. I've attached a photo for reference. For background, this is the first and only bass I've ever owned. Perhaps I'm being overly finicky about action height based on coming from guitar!

Hi Guys! First time poster here. Do any other Gretsch Junior Jet 2 owners have issues with the action on their bass? Since the warm weather has descended I thought it best to do some set up on the Gretsch to get it back to how I had it in Winter, but for the life of me I can't get the strings to stop buzzing on the frets when I totally straighten the neck out. I'm inclined to replace the nut and the bridge, just to give the strings a little more clearance but before I start doing any noob stuff I would like some advice! I've always taken my guitars/basses to a luthier for setup, but I think it's about time I learned how to do it myself. Please be kind Chris