Looks good LoneS
If your not sure dont add the epson. I have read some neg things about it and it could do more harm than good. I got some of the same spots from over watering (keeping the soil to wet not letting it dry out). Once the fan leaves are damaged they wont come back. I saw salt build up in the saucers. I use very low nutes whitch means, I think lol, they have a lock out and not use the nutes, so I flushed them (2 gal pot flush with 4 gal ph water) let them dry and then fed them. they are doing better now.
My plants all need water at diff times. Even same strains at same age. Today two bubbas wanted water, I could see before the lights went out that one SLH will need water in the morning and the maybe the 3rd bubba. The second SLH, 4th bubba and WW and WRhino are not close to needing water. You can tell by the weight of the pot. I wait till the leaves droop a bit, not wilt, wilt will mess the leaves up big time. When I water I get a good run off and let drain then after the wick off some water, leaves pointing out and the weight of the pot has lightened and are in full wick mode I feed them and get just a little run off. They will suck up the nutes. If you can learn to time it right you can see them explode. Look up Riddlemel's thread Make it Rain, seems to work great. Im here to learn and help when I can...