I'm not an expert on this so I will just go by what our lender told us.
Basically, FHA has rates and deals that come and go on an almost daily basis. As of right now, there is a charge of 2 points JUST to use an FHA load. They however are offering credit points. We have extra, over the 2 to be counted against us which are being used to buy down our rate.
2 weeks ago they had an offer where if we locked in our rate and closed under 45 days, they would give us over $1000 towards whatever we wanted (I believe closing, but I'm not 100% on that).
So, once you find a house it's in your best interest to lock in your rate when there's a good deal and you're going to close within 45 days.
FWIW, this is FHA only. I believe conventional is very different as you aren't really going through the government. With conventional, it's all about how much money you put down. The more you put down, the lower your rate (can) be. This also goes with FHA but instead it works with your PMI being lowered.
The more you talk the more scary it all sounds. You paid 2 points on your loan? That's a fail. Rule of thumb is not to pay ANY points.......EVER. Points = money right into lenders pockets. Think of it as putting down payment on a car lease...it's best to pay NOTHING.
And no, it doesn't change on daily basis.
You are putting WAY too much trust/faith into your lender.
What is your APR on your loan? You don't have to answer but I will tell you that APR is a clear sign of upfront costs FOR YOU to YOUR lender. If your loan is 3.25% and you APR is anything more than .1-.2% more than that......they are taking you to the bank.
To give you an example, my first loan was 6.125/6.25APR
Refinance 5.25/5.3APR
2nd refinance 4.25/4.35APR
Since you are going with Chase and don't have a decent down payment I can already tell you will pay too much. YOU WANT TO STAY AWAY FROM THESE BIG BANKS for MANY reasons. One of them is them being really REALLY good at hiding fees.
Reason #1(you will find out VERY soon) is because their contracts are like books and there isn't many people in the industry that can even understand it (don't count on your lawyer on doing it either).
Reason #2 they are known to take their sweet time to process everything (BOA is notorious for this)....Chase little better. DO NOT count on that 45 day closing/credit. NOTHING is guaranteed unless they put it on paper/sign.
Let me take a wild guess, you are using a broker too right?