Thanks for all the comments appreciate everyone's thoughts. To answer some of the questions yes I have Volvo penta trim tabs, yes I put all the weight at the back I can which includes a 200 litre esky half full of water and ice and occasionally some fish!, fill the live bait tank up and I also have a 25kg block of lead that I put in the back starboard corner. If I have two people sitting on the port side I put all this weight in the back starboard corner and still have to drop the starboard corner trim tab down to level the boat. On our last run back to Mooloolaba I did run a long way north and then pulled back south so that it was a straight following sea rather than a 3/4 on following sea just for safety. I was also working the throttle to alleviate the odd broach. Just trying to work out if I could stop it happening altogether. My last boat was a Seafarer Victory was pretty much idiot proof in a following sea and was actually a heap of fun to drive in one. My new boat has a hard top and quite a lot of weight in glass as well so maybe too much weight forward. I know one of the plate manufacturers welds a box in under the floor at the transom which he fills with lead to try to make them more bum heavy. Maybe the full closed in hardtops on these boats make them to nose heavy.
Thanks for the comments everyone.