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my HT angle is 72 -is that better or worse for front handling?
Neither, it's just a factor in the resultant trail. Measure your forks offset by lying them on a flat surface and use that calculator.
If you're mostly going to be on road I'd guess matching your current fork plus a bit more offset probably isn't a bad plan. You don't want to reduce trail to much though, especially on a tourer as it'll make it more unstable at low speed.
http://www.cyclist.co.uk/in-depth/816/how-does-frame-geometry-affect-a-bike
Depend on your head angle innit, a fork is not low trail by itself. Thorn do 52mm offset forks which should help. You could spec a slightly shorter fork too if possible. 10mm shorter = roughly 1 degree steeper.
http://yojimg.net/bike/web_tools/trailcalc.php
Edit: Thought that was Scoble's Oak for a second ^^^