7018 for code work is kept in rod ovens, they hold between 10 to 50 pounds and spin your meter pretty good. They also cook lunch really well lol. But a ton of contractors just keep them on a shelf on a lot of jobs. No, they honestly aren't low in hydrogen at that point, basically think of the coating as the absorbent things you get for your basement. But it will still leave an incredibly ductile and strong weld, just not one with a low hydrogen weld deposits. But for most applications that's more than fine, especially with a decent welder who's running hot enough to really dump some heat in, which allows hydrogen to dissipate out. After so long in enough humidity they'll be trash, and they are simply pitched since drying usually just causes the flux to crack.
Settings are personal but to give you an idea I'm around 95 amps for 3/32 7018, which heats the stub to yellow heat. On 1/8 they're usually at least red if not orange, roughly 120 to 130 amps. The weld itself will be glowing too, and if i can get away with it I'll burn even bigger rods if i can get them and run it in that position, basically using rod sizes to weld hotter and faster when i can, which is also greatly increasing the heat input to dissipate hydrogen and ensure penetration. I bend a single 90 degree bend on the rod right where it leaves the stinger straight out 90 degrees, and then tilt it to whatever angle best suits the situation, so that does warm the rod up more than simply clipping it. Bends in the rod cause resistance, so you can vary your heat on the fly without a remote pretty well at the expense of some rod length, which is usually not a problem if you're trying to turn down. But i don't turn down much, but if i do I'll often bump up the arc force up a bit so i can vary the amperage more with the arc length, shoving in tight building up metal but cooling the other side making it easier to control when weaving uphill. Almost any other time I'm running stringers, and at those heat settings you can simply drag the rod on the flux with a healthy drag angle and it'll blast the weld on.
We're still demoing out steam pipe that was welded with 6010 uphill lace caps, and they've been in service for decades, often on high pressure. Pipeline is traditionally welded downhill with cellulose rods, and the actual weld procedure is to weld hot and fast enough to input enough heat that the hydrogen mostly dissipates out. We weld with water coming out of the pipe right on the bottom where you're trying to weld, and on live chilled water and natural gas lines that are literally raining condensated water, so sometimes hydrogen is unavoidable in the field. On some jobs they've deemed that they care and they will demand having rod ovens and rod tracking, but many don't care so contractors do whatever they want. Often if it's something critical they'll open a new can and burn it that day and that's often good enough for the inspectors when they have them.
I don't have a rod oven at the house, I've got new cans if i think it needs to be right but i can't really think of anything i would use them for, but i also have a ton of opened high tensile cellulose rods (that i can run very well and are usually faster) so i usually just use them, meaning i very rarely use low hydrogen at home. I do like using ammo cans to keep rods fairly fresh, i forget the caliber but i have a couple mortar round ones that hold 2 50 pound cans, and really extend the life of cellulose rods. They would work for non critical 7018 storage too, basically like the little rod canisters but with a better seal. I thought i had a pic but i can't find it, i used them on the truck when i was running pipeline and i loved them. Worked really well for a weight to hold down my umbrella stand too, which was simply a plate used to lock up the lead with a nipple welded to it for the umbrella to sit in. I'll grab one if i remember.