That almost looks like they designed it for 1:35 and then just scaled everything down 
For those parts C1 and C2, I would cut the bit of sprue they’re on, off from the main sprue first — cut through where the 9 and the 10 are with snips, so you can get the actual parts down against your cutting mat. Then put a finger(nail) on top of the part itself to press it down, and carefully cut it off the sprue. Hopefully, that will stop it jumping away 
For those parts C1 and C2, I would cut the bit of sprue they’re on, off from the main sprue first — cut through where the 9 and the 10 are with snips, so you can get the actual parts down against your cutting mat. Then put a finger(nail) on top of the part itself to press it down, and carefully cut it off the sprue. Hopefully, that will stop it jumping away
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