The problem I had with mixing by graduated cylinders is I like to experiment some and it took forever to mix up 10 or 15 10 ml batches. The a recipe would call for .3 ml of a flavor and the graduated go by .2 so drip drip drip, is that .3? Being older they eyes dont want to see those little lines as well anymore either.
Doing it by weight I can do a test batch easily. Look at it like this. I am going to make 5 15ml test batches of this with various fruit flavors.
With using graduated cylinders it would take me over 30 minutes to mix up the 5 test batches, as well as a headache from the eye strain.
Doing it by weight I would line up 5 bottles. Put a bottle on the scale, hit tare to zero it out, drip in .47 grams of nicotine, grab the next bottle and rinse and repeat. Same with the other ingredients. 5 minutes later they are in the ultrasonic cleaner getting a speed steep. Say I dripped .5 grams of nicotine, so what. Its still a lot more accurate than guessing at the little lines in the cylinders.
Cleanup when using a scale is take the one or two pipettes you used, rinse them out, your done. Flavors I use a lot I usually buy in 4 oz size. At times I will pour some in a 30 ml dripper bottle so I wont need to use pipettes but if it is a flavor I dont use often then I will use the pipettes.
If others want to use cylinders to mix, thats cool. The main thing is your mixing!!! I just find for myself it is a lot easier and faster and accurate to mix with a scale. It is kinda like how we smokes, and how we vape. It is all about personal preference.
Our deck design was stolen. So was my idea of the airhole insert. We are on our third redesign due to all the theft already.
I know quite a few shenaniginators now, so sometimes I get a little confuzzled. 
