Setting HSYNC and VSYNC registers
Looking at the timing diagrams for the two devices:

Horizontal

HSYNC0 appears to equate to the front porch timing.

HSYNC1 is the total time for for HSYNC and HSYNC will be driven low for HSYNC1 - HSYNC0. For your display (which wants a single clock) this means that HSYNC1 should be HSYNC0 + 1.

HCYCLE appears to be the number of clocks for a complete horizontal scan line (the sum of HSYNC and display pixel clocks) so typically 525.

REG_HOFFSET is the sum of front porch, Thw and back porch and defines when pixels are driven relative to the start of HSYNC (which starts at the start of the front porch).

Vertical

These are very similar.

VSYNC0 is the vertical front porch and VSYNC1 is the total VSYNC clocks; VSYNC will be driven low for VSYNC1 - VSYNC0 clocks.

VOFFSET is the sum of vertical front porch, vertical sync pulse width and vertical back porch.

VCYCLE appears to be the total number of vertical scans per frame.

I referenced the timing diagrams on page 7 of the display data sheet and pages 15 and 16 of the FTDI driver datasheet.