@Terry Lao you seem to be the one not paying attention to the OP or the things being posted here. @Vivian O. clearly stated in her 3rd post on this thread, she IS PRE-APPROVED for a loan. I'm not sure why you keep harping on the pre-approval, since she mentioned at least once, if not more, that she is already pre-approved. And you keep mentioning FHA when the nature of her loan has almost zero impact in the particular situation she's having a challenge with. Additionally, she's working with a Realtor, and any Realtor worth their salt is going to make sure their client is qualified to buy -- so clearly she is qualified.
Vivian, I suspect that whether you go FHA or Traditional won't make much or any difference with your particular issue. Your issue seems to be where you're looking for your deals, and how much competition you have. So, as others have mentioned, you need to look at how you can avoid that competition.
If you are buying this property purely as an investor for cash flow, then I doubt any personal letters will make an impact. I'm not a big believer in the whole personal letter thing, anyway. You don't write a personal letter when you haggle over a used car do you? You don't write a personal letter when you buy something at an auction either -- which is pretty similar to buying a home in a competitive market like yours. If I'm a seller's agent, I kind of laugh at the personal letters and counsel my client to ignore the letters and focus on the STRONGEST BUYER. A distressed seller, in particular, won't give a damn about how sweet you are or how much you love the house -- they're in trouble and need as much money as possible as quickly as possible and that's all they care about.
I think the key issue is how/where you're finding these properties. The MLS is going to have the widest possible exposure and the most buyers to compete against you. If everyone desperate to buy a home sees the same deal, it's only natural that you're going to be in a situation with 30 bids -- and you'll lose every time because an end user will almost ALWAYS beat out an investor.
You need to be finding off-market properties and FSBOs that not many people will be looking at.
You might consider changing agents and working with a LISTING AGENT who focuses on listing short sales, pre-foreclosures, REO and foreclosure properties. An agent who does that already will have the mechanisms in place for finding off market properties, so you don't have to spend the time and money to do it. Now, you'd be working direct, which opens you up to some risk because you'd be working with the listing agent, or possibly in a dual-agency situation. But if you're aware of that and comfortable with it, you may have more luck finding a property you can afford without having to battle against 30-40 other buyers.