What weight rollers are you using? I suggest 10g roller or 12g slider weight for most applications. The sliders will also last longer once you get your belt issue figured out.
Although your HH has the large axle sprocket, I believe that year had a high geared final transmission. The 13/40 gear set will help you with gearing.
You replaced the clutch. What springs are you using for the pulley (main spring) and the clutch arms (set of 3 springs). My suggestion is to use a very stiff main spring (red 2000 RPM) to keep belt tension and speed up "downshifts" while using stock clutch arm springs to prevent excessive clutch slip before engagement.
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