Thanks TheSwain, mine was finally a combination of both wire that needed more solder. its now just 0.02 ohm higher in reading the resistance now.
dont know if i can call it good now.
just have one question. if both black wire and red wire solder is touching under the 510 (because of wire mouvement inside) , what can happen when vaping. are we protected by the board? they are not touching, but just asking. it was the first time that i have to solder 2 wires that what close to eatch other.