kk, so lvl 40 you probably aren't getting chain 6 and it's amazingly easy to get chain 5. I guess if it's an east ron (S) colibri burn you could get a lil higher but I haven't lvled a job that level in ages so I've never done one.
I will say that COR rolls take a bit of getting used to. I was a career DD before COR (heh, i still am). Never leveled BRD in a pt (it's lvl 9), took RDM to 37 but that was mostly solo so I had zero experience buffing people or trying to keep a cycle up before COR.
But yeah, make a recast macro and use it so you know when rolls are ready (again, if you use windower, this is a non-issue, it does that for you). Disengage from the mob a little early to either start the next pull or go buff a mage if they need it. Buffs before pulls. Like I said, you're not infinite chaining and below chain 5, you have an eternity to get that next mob for the chain.
As for your question in another thread, yeah racc is like that. You typically need more racc than you would need acc in a similar situation. I have a ton of racc gear. If i went crazy, I could get something like racc +115 on gear alone. Obviously I don't do that, but I have that much gear. If you feel your racc is lacking, try add some until you feel it's good enough. Vice versa, if you're never missing, maybe pull a little racc off for some rattack or STR instead. Having a parser is good for this cuz lord knows if you're pulling, DDing, buffing, you may not have time to count your hits and misses lol.
But yeah, at 40, chains won't be higher than 5 typically. I'm guessing you're in the nest and crawlers in the basement and they are so spread out. Maybe that's another thing that you need to think about. I've pulled on every job I have (I even pulled on BLM sporadically lol). Really get to know your camp, where the pops are and try to pull in a way that you can cycle through that too. For example, if you're at secret room in the nest, pull the crawlers at the mouth of the entrance first, then get the south ones, then head north. At some point at first ones will repop and you can't miss them. At that point, just go through the cycle again. If you know where the mobs will typically be and remember what you've already pulled, you spend less time hunting. But, if there's another pt at that camp too.. not a whole lot you can do. You can't watch them too.
But yeah, buffs > pulls.