Well....tried .you Irish red for the first time today. It tastes good, but not much head. It's not flat, but what can make it have a small head? It's been bottled for three weeks.
Also, got the banana vanilla stout brewed late Friday evening. Saw some activity in it late this morning. I added dehydrated bananas and a vanilla bean to the primary fermenter just to see what it does.
What successes and failures have you all had with adding things to the fermenter?
Low carbonation can be a factor in head. Although extract and partial mash brews are known for producing beers with "less" head. A chemical that I've used to help with this problem is called "Biofoam". It's cheap and you just mix a little in at bottling time.
I have a big spill about carbonation on several other threads that I'm somewhat infamous for, but I need a break from computer programming (have been writing code for my upcoming electric brewery build) so I will use the keyboard. I only go on about this because I must have had about 50 batches that weren't carbonated for crap, and I hate seeing others beer not turn out as good as it should. Hopefully this will help:
1. A lot of folks worry about adding yeast at bottling time, but it's really not necessary in my experience. I've even left beers in primary for months, a year, they always carbonate although it can take a bit longer. Most of my beers are carbed up nice in 1-2 weeks, though some take up to 3.
2. Keep your bottles at room temp, if they are cooler it will take longer for them to carb.
3. Never use DME to prime with! Corn sugar works better. Use a carbonation calculator such as the one in beersmith or any online one, you can even use the charts, I believe John Palmer has one. The temperature it asks for is the highest temperature your beer has reached. I bring all my beers to room temp or near it, at some point before I bottle them so I use 67-72F for that. That number is used to help calculate residual C02 in the beer left over from fermentation. Your volumes of C02 should be something like 2.5-2.7. Those numbers will get you to something like what your used to from store bought beer.
4. Measure your beer volume! Your bottling bucket should have graduations, if you have a homemade one you can use a magic marker to mark some. I try to get to the 1/10th of a gallon, but getting within 1/4 is good enough honestly. So after you've transferred to a bottling bucket, look at the amount you have and plug that into the calculator. If you think you have 5 gallons and you actually have 5.75, your beer will always be nearly flat!
5. Use a long sanitized spoon to stir the priming solution in. The mixing action of bottling PROBABLY does this well enough, but why take chances with beer?
6. Table sugar works equally as well as corn sugar, and costs WAY less. The conversions I've read say something like "use 12% less", but I have found personally that 8-10% works better. So if the calculator says to use 4.4 oz of corn sugar, I'd use 4.0 (using 8%). Brown sugar converts the same.
I've added lots of stuff to fermenters. Bourbon Barrel chips, fruit, and hops have been all equally good. Peanut butter being one that was, well not good. Just try it, if nothing else you'll have learned something.