Re: Formula, I give P BF's + 2 7oz Aptamil Stage One bottles a day. Never had any problems. I make it in advance, rapid cool and heat it when needed and then use it within 2 hours. It does have quite an aroma Fizz.
I used Aptamil for DS too, tried several brands but that seemed to cause less reflex than others. I did find that the ready-made cartons as opposed to the powder made him more sicky though. He was also on Gaviscon for months but I don't remember him suffering with any constipation.
If people think formula poos smell bad, just imagine the delights that await you in a couple of years when potty-training Only this afternoon I collected DS from Preschool where a lovely nappy bag of poo encrusted pants and shorts were hanging on his peg waiting for me. (DS told me he was too busy to go to the toilet
)
Re: DTD, Not here yet, just don't fancy it TBH. DH is fine about it, we have 2 DC so he knows we'll get back round to it sometime. (Unfortunately neither of us can remember conceiving baby P. Either it can't have been that memorable or we were both knackered and half asleep 
).
I'm 34 and DH is 41, we're not planning on having anymore DC so have talked about him getting the snip when we do get back to it.
Re: The Boob, I agree with Ali. I always offer one up to P if she's starting to get a bit antsy. Makes life easier if you catch them before the screaming starts. And like Dairy I also find DH better at settling if the boob doesn't work. At bedtime I always feed her and then if she doesn't fall asleep on the breast pass her to DH to bounce on the yoda ball.