I also feel that the faction hits garnered from the Gnoll fang quest in Qeynos in regards to dropping your Corrupt Guard faction are unusually high on Project 1999, as I recall turning in many many fangs on Live without becoming kill-on-sight with my good race/class/diety toons. However, on P99, my Tunare half-elf druid is KoS to Corrupt Qeynos guards. I have found "Mr. Number One" to avoid is Lieutenant Dagarok in North Qeynos, because he is a L50 shadowknight and will harmtouch dat booty. I haven't searched for proof of what the faction adjustments for the quests should classically be, but this could be your initiation as a bug sleuth for Project 1999! It is often a thankless, yet rewarding job.
Be sure to use the Wayback archive at
http://archive.org/web/ to search for old Allakhazam forum posts or on other websites. For example, normally if it is a question of spell effects or melee ability, you could search the Wayback archive for the appropriate website. Enchanters used to (and still) post all their relevant knowledge at therunes.net. Rogues favor thesafehouse.org.
As Everquest Live quest completion text is now reporting "plus" or "minus" faction adjustments when you complete a quest, the P99 devs are also currently accepting faction adjustments witnessed on Live EQ to program quests on P99. If you happen to be able to access Live and can screenshot the faction adjustment from handing in a fang, that would give them some insight as to what needs to be in place on Project 1999.