Adding to Single Compost MM

When I topdress with compost I am not shy about putting it on. Typically I add an inch or two to the entire bed surface. It is different with fertilizers and I recommend following the label directions.

Have you thought about making a simple wire hoop for making your own compost? It's easier than burying it.

I'm far from an expert, only my second year but I had same issue last year. Here is what I did and what I would do with what you have available.
First coffee put right in your garden can cause more problems than it helps. Before I found SFG I did all container growing. I would put the grounds from my morning coffee in and work it in a bit. Before long the top 2 inches was more coffee than anything else, it would dry out fast and when kept wet it would get white mold. My coffee goes in the compost pile and I use some as part of my compost tea mix.
Worm casting, a little goes a long way. It helped my first year SFG a great deal. I put a small handful in each square. Also good for tea.
Pure kelp can be very strong too. I wouldn't add it directly, I would just sprinkle small amount in your compost blend and use it in your tea.
The Kellogg product sounds pretty good but it has peat in it and may have thrown off your ratio(1/3,1/3,1/3) a little bit. Top dressing with a good blended compost will help the ratio and feed the soil.
I would strongly suggest you add a couple more items to your list. Mushroom compost is cheap and pretty easy to find. I see on your local craigslist rabbit manure and other compost cheap or free. http://fresno.craigslist.org/grd/3741938031.html Do a search on the forum and you will find a lot of us love our rabbit poo. Here is a informative article on it.
http://riseandshinerabbitry.com/2012/03/31/the-benefits-and-uses-of-rabbit-manure/
Take your bag from Lowes and bag of mushroom and spread them out, add around 20% to your volume of each of the rabbit and worms castings. Saving the rest for making tea. Go light on the kelp and mix that all together. It wouldn't hurt anything adding it right away, but you can wait until you feel it needs it. I like to use my hands to add mine, one or two handfuls per square and I work it in with my fingers.

Hope this helps

I would just use some simple organic fertilizer (Chickity Doo Doo or similar) and concentrate on getting your compost pile going. You could also water with compost tea, fish emulsion, etc. (fish emuslion smells as bad as it sounds).

I've also heard that rabbit manure can be added directly to the garden without comosting first and not harm the plants.

My thinking is that you began the season without using the Mel's mix recipe that calls for a 5 way compost blend, and your results reflect this. I would make every effort to find five different types of compost, including manure composts and take the time to make the blend and then top dress with compost a few inches deep all across the bed.