BOI Mortgage - Best deal?

I am only allowed to deal with BOI for the mortgage for the house that I am buying under AHI. The council has directed me to the branch in my town, they offered me choice of rates and I decided to go for the tracker.

It is 4.8% for the first 12 months, changing to 5.3% after 1 year.

I wanted to reduce the % after 1 year, the LTV is 58.33%. But BOI has a policy of lowering % only on loans < 50% of value (!), and there wasn't anything available better then 5.3% for the life of mortgage. I was told that % can change in a year's time - but since I will have absolutely no choice in lenders - we cant remortgage - sure the % I am getting now will most likely be my best deal for the rest of life of my mortgage.

I went to different branch, and they wanted to 'help' me - told me that will apply for lower % after I fill out paperwork. My branch found out about that (Dublin rang them), called me and asked why I was going with the other branch - I explained, but they insisted on me going through them, explaining that the rates are the same for all branches and if they couldnt get me better deal - no one else would.

Should I go with them? Did anybody experience something similar?

Sorry, I know its slightly off topic but how come you not use the other 3 mortgage providers that do AHI mortgages? First Active, EBS and IIB.. Why are you only limited to BOI? (sorry if private )

That is because the council I am dealing with only has agreement with BOI in place, I asked them this question too and their respond was - I can only go to BOI for my mortgage. Thanks.