I'd say solid advice from BBfan, as usual. Either flush it and be done with it or don't.
I'm not familiar with the fish emulsion, but I'd be willing to bet that your plants are starving. You said that you have only fed them 2x in 6 weeks. Plants use alot of energy producing flowers, and that energy has to come from somewhere...nutrients.
You need to feed them once a week, especially since you switched to a soil with no nutes in it. Like I said I'm not familiar with the fish emulsion, the GO freebies I got have an emulsion included as sort of an add on to the regular program. Is the stuff you have 1 part of a set? If so you need to get the rest of the products that go along with it. If it's not part of a set, then I would say that the nute is seriousely lacking in something.
It could also be that all the transplants and ***** footing around with being afraid to overdue it with nutes during the veg cycle, that your plants were lacking the N they needed to have stored up to get them through the bloom cycle.
How to fix it now...it's hard to say (especially not being familiar with your nutes) If it were me I would do one good flush as recommended, and make sure that the run-off is pH'd in the zone. Imediately after I would feed it with your bloom nute, and also apply some kind of micro nutrient...see if the company who makes your nutes has something to go along with the emulsion, if they don't, get something from any of the reputable companies that makes a micro-nute.
You are so far along with this one, you may just have to settle for what you get...and chalk it up as a learning experince. If it's an 8 week strain...you really only have 1 or 2 more feedings that they will get any benefit from. So you may just get what you get...but you have definately learned something from this and thats always a bonus granted from any mistake.
You've got some buddage there...so it's not a total loss, and trust me when I say I have seen worse!
I do think that plants need to be fed once a week, if your using a soil that has not been amended, and definately when using chems. I understand wanting to go easy on the nutes, but you can go too easy on them to, and not give your plants what they need.
In the future when feeding a strain you have not grown before, use 1/4 str. the first week, 1/2 str the 2nd week, 3/4 the 3rd week...etc and just keep gradually going up until you get just the tips a slight nute burn, and then back off a bit. Then when you grow out the clones, you can basicly start out with close to the max feed that the donors used (I usually take a step down from the max for the first feeding, and build back up, just to be safe) But you don't need to start at 1/4 strength once you know your plants (unless 1/4 is max...but I doubt it)
Anyway...thats about all I can think of right now man...like I said, they don't look THAT bad...your going to have something to smoke, it just may not be the max yeild for that strain...but you will get something. PM me again if this post triggers any questions, because I have not been on here all the time like in the past few months...when I get on I usually only check out any PM's and a few threads. I haven't been reading everything from top to bottom. Good Luck bud! Hang in there...you will be smoking on them soon!