Hi littlewing,
Jack is no longer in Australia but you can still contact F-one Australia directly: info@f-one.com.au
The first step is to make 100% sure that all your lines are exactly the same length as per my video tutorial here:
www.kitebud.com.au/kitesurfing-online-courses/kitesurfing-line-tuning/ It's possible that the bridles are causing the issue as well. You'll have a hard time finding a matching set of exactly the same bridles but you may get lucky and be able to order those through F-one Australia or F-one International. This could take some time though as it's rare that shops/distributors or even the actual Factory have those laying around in stock.
In my opinion, the best and quickest solution is to get bridles custom made based on the exact bridle measurements. F-one will be able to provide the bridle specs for you and a competent sail maker / kite repairer can assemble those for you to match the exact specs. If F-one Australia can't find the specs for you, F-one international surely can help you :
www.f-one.world/contact/ It's highly likely that the bridles, just like your lines, have shrunk over time. If the kite repairer made new bridles based on the shrunken length of the previous bridles, that's unfortunately not going to solve the issue. That's why you should always make new bridles from the spec sheet and never use the lengths of used bridles as a reference.
As for the pulleys, if F-one Australia doesn't have any in stock, you can get them in Australia here:
www.fixmykite.com.au/f-one-bridle-pulley-plus-pigtailGood luck
Christian