Fixed vs variable pricing
Fixed rates track bond yields, while variable rates track the prime rate. When bond yields fall, fixed rates typically follow. Variable rates move when prime changes.
Why your scenario changes the rate
Insured, insurable, and uninsured files price differently. Down payment size, amortization length, and occupancy can all move you between buckets.
Use rate comparisons responsibly
The lowest rate is not always the best deal. Consider prepayment privileges, penalties, and portability before choosing.