At first Dandare I'am not an expert, been away for 15years
I saw a video about shocks during the Ifmar 2011 in Finland. Some guy's cut away the middle section from the rubber topcap, so there's only left a rubberring left to seal the shock topcap. I don't know this will help you, but the guy's from the video are enthousiastic about this!
Hope this will help
