Bio Bizz All Mix, if I'm not mistaken that's a pretty hot mix right? Be careful with any additional supplements you use, start slow. Molasses you can always use full strength unless they aren't drinking, if plants stop drinking adding more molasses will rot your roots. And I believe Iguana Juice is Advanced Nutrients right? I just have a little experience with Advanced Nutrients, I don't like their advanced prices when they're no more advanced than the next reputable brand. Not hating on your decision, I'm sure it's a fantastic-working fertilizer.
One problem with liquid fertilizer companies is that the majority of them require you to have multiple supplements of the same brand. Whether this is for profit or because they find what works best is not stable in one bottle, and the cost can add up quickly. As an organic grower, your best bet is to start working on your own soil mixes. Alternatively, you can just follow subcool on the forum and look up his current Super Soil recipe. Something that is easy that you can start doing right away is making your own compost tea! Look it up here on RIU, Heisenberg Tea is a good one to search. Pour it on your plants and watch them go nuts!
The issue with using prebagged soils is that they will eventually deplete, not to mention they can carry pests. I've gotten everything from fungus gnats to spider mites in premixed soils. I now know to take home the soils, pour them out in a tub or a trash can, add water (and supplements at this point if you'd like to start spicing up your soils), mix and let sit for a month or two, the time it cooks depends on what supplements you put in your mix. Either way, this time makes sure all the bugs are dead, all the nutrients are readily available and not so hot. Most high quality soils you purchase are already cooked, but I've found several to be hot out of the bag and benefit from cooking, not to mention this kills all these damn bugs. If you amend with organic supplements cooking is mandatory, not optional.
As far as cutting the buds, it looks like it you might have to on just that extra-burnt nug. Post more pictures before doing so, I don't like to give that kind of advice unless I can be more certain. If you cut that burnt top, make sure it's a clean cut on the stem and try not to cut flower beneath your blade. The flowers beneath will swell into the big beautiful buds you're after, it won't be nearly as much loss in yield as rot would cause. You'll get two pine cones pointing in opposite directions at the top of the plant where you had to cut.
If you decide not to cut and the plant is too far burnt, your buds will swell until they encapsulate the dead plant tissue. The moisture will cause that dead plant tissue to rot as if it were in a petri dish within a dark room. Bortrytis is one of the absolute worst diseases that can affect the above-ground portion of your plant, worse diseases exist that effect only the roots. Bortrytis is also known as Grey Rot or Bud Rot, anything it infects or comes into contact with is destined for a garbage can. It spreads very fast and once it appears you typically have to chop everything down, scrub down your room and start over, salvage what you can and watch carefully while drying and curing.
I was very fortunate a few crops back. I got Bortrytis from all the rotting pumpkins left over from Halloween in my old apartment complex. I was in week 6 or 7 of a 7-8 week crop and mostly everything was ready. I was able to salvage 2/3 of a beautiful smoking crop. Unfortunately the main terminal of each plant was infected where it was thickest, so those were a lot of premium nugs lost, but that's often how it plays out. Either way, I had enough to vend to the local dispensaries to recover whatever I spent on the grow, and I had a decent amount to smoke until the next crop was ready.
But yeah, if you couldn't read alllll of that, just post more pictures.
