7.0 isn't bad pre-nutes. But it doesn't look like a ph issue. It does look like the leaves are retaining water, though. Have you tried Mydol? (kidding)

I'm not much into organics, but I do know they break-down slower, which acts like a time-release for the nutes, metals and micros. I'm just wondering if the micro's (or metals) are slowly accumulating...? Have you flushed lately? Using fresh soil?

Have you tried eliminating one suppliment/additive at a time? The molasses would be the first I'd ditch till it get's figured-out. Then the kelp or fish fert. What did you change, just before the symptoms began?

No foliar sprays that could clog the pores? No overwatering? No voodoo or misread incantations...? (never hurts to ask...)