I hate to complain (although I will propose a couple of solutions), but I really think that giving FEP (especially STR) with a drink just isn't going to work the way it's set up. Here's how I think it'll go down.
(hmm, this turned into a bit of a wall, if you read the first line of each section you should get a good idea of what I'm talking about)
Phase 1, the initial rush
-many people, IE those that don't care about balance, already have plenty of HHP (which will be most people), and realize the power of beer, are going to make several casks of beer (wheat is so easy to get that they'll be able to)
-drink ALL of it, get 2 strength at the cost of 5 HHP as many times as they are comfortable.
-their strength jumps and their HHP plummets.
The fun part with Phase 1 is that the people that already have higher stats are the ones that can afford to increase their strength this way the most.
and new player with 10s (if they can get beer) would only be able to do it 2-5 times (so 4-10 str gain), someone with 150 str and 100 con would probably feel comfortable doing it 20 or more times for 40 strength.
Phase 2, linear strength/charisma growth
-for the rest of time, anyone can get 2 strength in the amount of time it takes to regain 5 HHP, no matter how high your stats already are IN ADDITION TO what they already get from regular eating.
I don't mind Phase 1 so much, because it'll only really happen once then people wont have enough HHP to do it anymore (they could wait a long long time and do it all at once again, but that really just lets them make up for all of the time they weren't drinking in between). But, Phase 2 does not seem in line with the current system of diminishing returns on stat growth because you can always drink as much beer / wine as you need to get the event.
Solutions:
-give us a thirst meter that fills, then let us drink more things (milk gives one CON, water gives nothing, maybe make us a juicer so we can make carrot juice and apple juice/cider) so that people can't drink infinite beer whenever they get their hands on it (and don't kid yourself, supplies will be close enough to infinite that it makes no difference)
-something else that limits how much we can drink at a time
-make the 'pain' event do damage based on your highest stat, something like 1/4 of your highest stat in HHP damage instead of a static 5, this way in Phase 2 you have to wait longer to get your HHP back if you're one of the super players and less time if your new.