Context: https://legacy.curseforge.com/wow/addons/sod_bislisttooltip?comment=8

I'm undecided whether I should do 'interpretation' to determine the best possible suffix for a given item as my philosophy with this addon is to strictly use the data available in the BIS list. While the Rogue DPS list mentions +4/+4, other lists do not mention the exact combination that is BIS. I may just leave at more reliable suffix matching or may interpret the best suffix available for the current level cap. I'll think on this more. For now, I'm focusing on making sure suffixes listed in BIS lists (like 'of the Monkey') match properly in game regardless of client language.

Thoughts:

1. I could only display the tooltip as BIS for max level suffixes for the given phase. This still wouldn't address the issue that a suffix roll can be +4 Agility/+3 Stamina or+3 Agility/+4 Stamina. It could be situational which roll is best.
2. Some BIS lists include the rolls as short hand notation like +4/+4 (ex: Rogue DPS list currently has the item text of 'Spectral Necklace of the Tiger +4/+4'). Some BIS lists link to the random enchant ID (ex: Sage's Mantle of the Owl has rand=767 (which is +6 Int/+5 Spirit) in the link from the Priest Healer list). Most lists however don't contain the shorthand notation or a link with the suffixid

#2 seems like the most in line with the addon's philosophy of using just the data available in the BIS list source. #1 would apply to more items though. Either way, I don't feel this is urgent as (a) #9 updated the addon to properly match the suffix type/name (ex: 'of the Bear', etc) and (b) most people use the addon in raids and, to my knowledge, no named boss drops a BIS item with a random suffix.

Please keep in mind that BiS lists can be made by people themselves not being able to distinguish between different suffix ids for the same enchantment suffix. As you say, someone linked the "Sage's Mantle of the Owl" variant with +6 Int and +5 Spirit, I'm pretty sure it is also available as +6/+6 and it is uncomprehensible why +6/+5 should be BiS, but +6/+6 should not.
So I think at last you will need to interpret the lists either way.

Will be looking into this next. I need to determine a reliable way of finding the best possible roll for a given item. I originally thought of just mapping the max possible roll for a given suffix (ex: '...of the Tiger') but I need to investigate this more as at very least, this seems to vary based on the item type. For example, the Rogue DPS BIS list mentions the recommended rolls and has the following:

• Cutthroat's Cape of the Tiger +4/+4
• Pathfinder Gloves of the Tiger +6/+6
• Scaled Leather Belt of the Tiger +6/+5
• Spectral Necklace of the Tiger +4/+4
• Savannah Ring of the Tiger +4/+4

Back, Neck, and Ring all are +4/+4 while Gloves is +6/+6, and Scaled Leather Belt is +6/+5. Perhaps +6/+5 is a typo as the Enhancement Shaman DPS list mentions the same belt with a +6/+6 roll:

There aren't too many options for belts in Phase One, so just head to the auction house and pick up any of the BoE 'of the Tiger' belts with a 6 Strength and 6 Agility roll that you can.

Need to do some data mining to fully understand the possible permutations for max lvl of 25.

Do you really need to understand them or is it sufficient to know them as they are listed with the appropriate items on Wowhead?