Chain Killer!! Tips?

Ok since Im already get accustomed to Samurai..most of my playtime is with this char to farm prod mats for my prev. account (enchy) and imo i found it faster to kill than hwiz /bish that mostly spamming one skill.Since its auto atk with round up buff kills another 2-3nearby mob.
I know most samu here already know how to "chainkill"(is this even yhe right word ?x.x) but can you explain it more further?
From what i discovered from killing mob these are my tricks:
-Observe the area and look for two or three mob that is close to each other
-Check the mob's hp and make sure you can 2hits them(by normal atk lol)
-Lure one mob from far away into those another mobs that is close to each other and make sure the range of round up skill will reach all of them
in order for them to attack you
The situation should be like these:
Kill 1 mob using 2 normal hits
The 2nd hit will kill the first mob and the round up skill will proc making the 2nd mob to get hit also
Then 2nd hit to the 2nd mob will kill it and maybe the third one too then the newly respawn will also drawn and so on making the kill "UNSTOPPABLE!!"
Another tips
-make sure the mob respawn at that particular area
-dont use shippu jinrai because if you killed them too fast the chainkill will interrupted
-dont also tap those shiny whatever on surface (that looks like a gift box in a map)as they have chance to make your normal atk to deal twice dmg or have atk interval cut
-use set that has -maxmp% since round up skill will reduce your mp 5% per kill
In my case im using :
LamiaIV
-20%maxmp and for lifesteal lols
HeinrichMail -for atk% and dmgcut if Hp<25%
-just in case some shitty mob became wierd and deals wierd dmg
Hcb-lifesteal and -5%maxmp
-just in case lamia's auto dont procs much
Pretty Bouquet -get f.nectar by atk for making sweet syrup
With this set i have 1.3k mp(with leviam al e.e) and the mp reduced by around 90 per round up
if my mp wasabout to run out i just use thick remagic and it heals around
600mp and let my character do her sweeping job i just tap mp pots and do other things like searching gc's
Downside in this is it will consumes too much pots if i farm longer

Then again i think of something that will make it more efficient and this idea went up in my mind:
"If round up consumes 5% mp ,what can i do to make it recovering without using pots?"Then i came up something..something that will recovers mp while attacking.."ohh the autoskill!"and then searched "stat that has mp recovery by atk" and found two gear (sofys glasses and farfalla)....And the result of their auto is very disappointing as it only heals mp per atk by 1% e.e
Another thing i had in mind is to create -100%maxmp set..sad theres nothing in spec or in add(except hcb)
but theres in a weapon..its name is Sacrifice(its appearance is like gram but color black) ..i havent tried it in samu but its autoskill instanly killed my ench by 1 normal atk when im farming javali spec many days ago
So yeah im stucked in this problem

Is there any way or maybe consumables that regenerates mp per second that is above 5%?I know my idea to chainkill mob is so absurd but if some of you know idea how to overcome this im sure it will do less effort on farming..