If your to low your bombs wont have time to transition into a nose down attitude of there ballistic arc so will bounce because the have excess forward speed and a long fuse time given they are low drag bombs, if they are dropped from high enough the forward speed is carried into there vertical speed thus exceeding there natural terminal velocity.
Also a bomb with a long fuse delay hitting something hard its fairly obvious what can happen with excess forward speed (as Sir Barnes Wallis made a point of proving most notably with the Upkeep bouncing bomb on soft water) its also in part why high drag bombs came about.
With respect to the game it may be possible that a crude unseen greyscale base texture may be employed on the terrain to show a value a “hardness”
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