The leaf tips are showing nute burn so no, I would NOT be raising the EC at all, I'd be lowering it a bit - to 1.0 or 0.9...
You don't indicate a pH you're maintaining here which is another very important part of ALL grows but with DWC especially. I use this chart to help me figure out what to do in certain situations - but you need to 1) take some of it with a grain of salt and let your plant really dictate the proper course and 2) keep a log of your EC and pH taken at the same time every day... both EC and pH will fluctuate during the day so it's important to take the measurements as close to the same time as possible... head to this link and scroll down a ways... the charts (there are two of them - one to be used if your plant is drinking, one if it's not drinking) are called Hydro, EC and pH Imbalance Chart...
https://percysgrowroom.com/ec-and-ph-fluctuations-in-hydroponics/
Good luck!