Teedaawg:
I learn best from example, better than anything else...
Here is an example. I first rewrite the Titus formula to have everything in this post,
D = distance indicated in yds
E = elevation indicated in ft (sign + in the formula if upward, sign - if downward)
W = wind in mph
A = 0.004
D' = new effective distance
Headwind
D' = [D + E/3] / [1 - A * W]
Tailwind
D' = [D + E/3] * [1 - A * W]
Examples
Headwind and upward elevation
D = 150 yds; E = + 12ft; W = 10mph
Then
D' = [150 + 12/3] / [1 - 0.004 *10] = 154 / 0.96 = 160 yds
Headwind and downward elevation
D = 150 yds; E = - 12ft; W = 10mph
Then
D' = [150 - 12/3] / [1 - 0.004 *10] = 146 / 0.96 = 152 yds
(however if there is a big downward elevation, the ball stay longer in the air before touching the ground so the effect of the wind could be a bit larger)
Tailwind and upward elevation
D = 150 yds; E = + 12ft; W = 10mph
Then
D' = [150 + 12/3] * [1 - 0.004 *10] = 154 * 0.96 = 148 yds
Tailwind and downward elevation
D = 150 yds; E = - 12ft; W = 10mph
Then
D' = [150 - 12/3] * [1 - 0.004 *10] = 146 * 0.96 = 140 yds
Hope this is clearer. Once again, this is an estimation. Spin and dinging or not the shot (especially with full backspin) can influence strongly the distance of your shot. For example with R11 and Callaways, no spin or just 1/4 of back spin makes noticable difference in the distance travelled by the ball.
Regards