they have all/all items 32% if this is what your asking about? http://everquest.allakhazam.com/db/item.html?item=83017 the issue i think your find is that the higher versions are raiders only items I think
http://eqitems.13th-floor.org/items...next_3=0&field_4=&compare_4=&text_4=&next_4=0 I assume they mean Block %.
Don't believe there have been any new +% skill mod items introduced since TSS expansion. Six years and counting, don't expect to see such items ever again. Its a design decision, not an oversight.
Backstab % is on current items. Fabled PoP had an assortment of mods and came out after SoF was launched. A Solteris Bow with 5% Archery and an Aug with 8% Dodge are the last non-Backstab skill mod items in permanent content. And the Alaris Tear.