Hear me out as I am luaghing well smiling about seeing them rocks cracked in half like that... Needless to say when I started out I think I posted me dumping a wheel barrow full of gravel, chunks, and broken pieces, I was so upset and ashamed for wasting that many rocks. SLOW DOWN! Number1 key Im sure some will agree, look at what u are doing see where the humps are change ur angles, it seems that ur angles are off and the shock is snapping the piece. Use the tip of what ever bopper u are using. it should barely make contact with the platform, dont forget to abrade. Hey that all I can say! Good luck and keep at it!
AncientArcher