Apparently there are 2 better zones to pull than korroloka tunnel but we all know summoner burns are based off lazy people to get to 75 therefore no ones been a pioneer. I have had long talks with gms keeping them on my good side incase people do diaga etc . they have suggested in there own personal play time and experience yuhtunga jungle and ordelles caves served the highest amount of xp and ease of pulls. as far as sea serpent grotto goes there are too many turns and too much water to pull by which would be a leech disaster not to mention the only being able to go up and down in certain areas and the mobs levels vary way to much.
I would suggest trying ordelles one pull left side one pull right side i think best place to burn would be in the stroper rooms or somewhere in the middle. as for yuhtunga ive began my math on mobs mob levels and have practice pulled there. seems mobs depop there easy so alot of mobs would need to be treated like leeches in the tunnel. slow and steady and meet in the middle. im not an expert but im good at pulling so if you want any tips pm me on here or use my email k thx