I have been doing a bit looking on here and found that my main jets are too small for premix at 30:1, main jets are stock at 135 in both carbs, you can change them between 170 to 185 as per the HRC jet kit and improve the emulsion tubes by drilling extra holes. HRC kits and JHA are as rare as rocking horse manure and if any one has any please let me know. But to start I will change one thing at a time, starting with the main jets and checking the carb balance too.
cheers