Have anyone tried upgrading to low profile or full new system?

If you still have the original seaway main block system with the two singles above the ratchet and double block combo, then you don't need a low profile jib system just yet. However a remote traveller might be useful, if your crew needs to adjust from the wire.

The whole thing works together as a system. A low profile main system allows you to further rake the mast, if you have shorter shrouds and a longer forestay adjuster. After this is accomplished, you find you need low profile jib blocks to fly the jib correctly. Both Hobie and Murrays sell the stuff in the form of individual parts or as a complete system in the form of a kit.