Maybe helpful, maybe just a good laugh:
The first time I installed a new bathroom faucet I had also replaced the shut-offs, it was my first time 'sweatin pipe'. When it was all together and ready to go, I fired her up. Some water, then trickle, then next to nothing.
The aerator was blocked by all the multi-grains from the multi-grain bread I had used to dry out the inside of the pipes...Now I use white bread.
Sorry you're frustrated, hope you're at least laughing now