Daveee its the rim when I had my trialtech rim with Der kaiser I had the same issue, with the sl and the undrilled, when I got my echo rims its been good a gold, I know not ideal but if you changed the rim you'd be fine.
I would suggest:
http://www.tartybikes.co.uk/handlebars/because_6061_riser/c136p11584.html
As there same geo as trialtechs
And stem wise this:
http://www.tartybikes.co.uk/20_inch_stems/tartybikes_forged_20_inch/c29p11564.html
Make the bike ride a lot better if your on a budget.