Different advance curve in 85/86 EA82T distributors .

Hi all , I was reading recently in an Australian factory WSM that not all conventional distributors had the same advance curves in early EA82T engines . In some obscure European country the mechanical advance mechanism was set to be all in at about 2200 rpm where the Australian and catalyst equipped cars had it all in at around 2700 rpm .

I'm interested in this because I've made inlet system mods that make inlet manifold pressure rises to atmospheric more quickly and easily and I'm losing some of the vacuum advance I previously had at light loads and part throttle .

I reckon if I can play with heavier bob weights and or lighter springs I can get the mechanical part of the advance curve to be all in earlier . I don't think under full load it would ping because high load total advance equals all the mechanical advance minus whatever the diaphragm pulls out when the engine is on boost .

Inlet mods are all the plastic in guard stuff gone and an ovalized section of 3.5" tube feeding the lower air box - larger hole into box and inner guard .

Spider manifold NA cams porting and a Garrett GT2554R turbo .

Header is a 1.75" TWE type thing .

Anyone alter the early dizzy's advance curve ?

Cheers A .