the key is with drum brakes is to first get the shoes set and ajusted as close to the drum as possible with both brakes off as the shoe ajuster effects the length of the link between the shoes (dont worry about slight rubbing noise but shoud be turnable by hand on the drum) the h/brake cable has a plastic stop in the back plate so a slack cable should not effect the shoe ajustment too much.
now pump the hyd brake to settle the shoes and possiblely edge the auto ajuster out a click, recheck to see if you get a slight restence and contact noise if not edge the shoes out a bit on the ajuster manualy.
when this is done the h/brake should be easyer to ajust.
it is possible you have cut your cable inner too long and it needs to be a bit shorter.
i set mine with the ajuster right in and now the h/brake just works ok all the way with the ajuster all the way out
there is not much room for cable ajustment with the postioning of brackets on the chassis.
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