I guess I shouldn't call it a slam, its that Goldwing issue when you hit quick sharp bumps. The 05 I've ridden plus the rental 12 and mine all have done it. Mine has done it from day one before I installed the brace and it was 2 wheels. I believe the anti dive is working as it should because the front end gets stiffer when the front brake is applied. I did take great pains to make sure the brace has been installed properly, I followed their instructions to a tee.
I'm kind of Jonesing for a Traxxion AK-20 cartridge setup in the front forks and my friend who has done a bunch or them is just the guy to make it ride and handle even sweeter. He's going to be doing the AK-20 to my dads 09 Triglide this winter so next summer I'll see how it works with that. After reading some articles and checking around I'm very impressed with Traxxion products, their machine shop is clean enough you can eat off the floors.
Put the AK-20's on my 02 1800 (it's still a 2-wheeler) and they are nice. Would be interested to see how they work on a trike.