I know you prefer not to mix dry chemicals but I'm in the chorus who sing praises to ID-11 or D-76. These identical general purpose developers are the baseline to compare if you experiment with another developer. Plus, they work well each and every time with FP-4+. If you change developer from the standard, it should be for a specific purpose. FP-4 has a shorter toe than Tri-X. I suggest shooting at EI 80 unless the light conditions are flat. In low contrast shoot at box speed and slight over development to increase brilliance.