Tryker,
You're gonna have to educate me on this. The only set of REG risers that I have seen for the GL1800 definitely move the handlebars back in addition to up.
See installation photos here:
http://goldwing.eurekaboy.com/risers.htm
There are two sets of holes offset by at least an inch or so, so the bars are going to move back when attached to the second set of holes as designed.
If I'm missing something, or there is a different REG riser model that doesn't have two sets of holes, let me know, 'cause I'm confused on this one.
The only way that I can see to move bars up and not back would be a simple shim with only one set of holes and some longer bolts to attach the bars in the same holes and longitudinal location on the bike they started in.
***