What kind of problems are you referring to?
Organic is fine, organic based is easier and often more practical. The biggest issues I generally see are composted ingredients that technically meet the criteria but may not be fully enhanced with all the biology (bacteria and fungi) expected. These along with mychorizzae and other inoculates may give a bacterial body count, but often don't refer to the "active" count. Also many folks are paying a small fortune for organic "bloom enhancers", bug sprays, etc that are nothing more than watered down molasses or dish soap you could by cheap and mix easily enough.
I wouldn't throw the baby out with the bath water, but the best results are achieved with quality ingredients. That doesn't necessarily mean big name brand. Also pay attention to the NPK if it is listed. They can be real small.
Vermiculite holds quite a bit of water and can make your potting mix soupy if too much is added. Other options are1/4"-5/16" lava rock, or diatomaceous earth chunks like bonsai growers use and of course perlite.
FF/OF has a high nitrate N that is very mobile in the mix. That means if it is watered until it drains the water is washing away the nitrogen over time. I personally like to water until about 15% of the water added runs out to keep the salts down. Keep an eye on the nitrogen for best results.
I looked up the label for the MG Organic and it has a pretty low NPK. You're going to have to fertilize right away IMO. I noticed that the main fertilizer is "pasteurized poultry litter and manure". I'm going to give them a call to see if they have screened for clopyralid and aminopyralid. These are broadleaf herbicides that continue to show up in manures and are resistant to composting. I don't know how they react to pasteurization. I am not saying it is in their mix! I don't know. Just whenever I see manures I like to check it out before using it.
Black Gold Natural and Organic mix reads as follows:
"Our 100% organic base consists of screened earthworm castings, Canadian Sphagnum Peat Moss, compost and forest humus. We blend in perlite and pumice to ensure optimum aeration."
I couldn't find any NPK listing. It generally isn't required for planting mixes that don't add fertilizers. I can't say much other than I suspect considerable fertilization would have to occur right away.
Did I help or just ramble on like a boob?