suicide doors front cups?

[pkj]

i am using the suicide door front bracket kit on my 68 1/2 ton. things that bother me are the cups dont drop all the way in to the lower a-arm. they are just a little to big to hit the bottom. the other is when i jacked the truck up last night with no air in the bags the lower lower cups came right out of the a-arms. today i trimmed the cups down 1 1/2 inchs and beveled the bottom edge so they will seat deeper in the pocket. am i correct in there is nothing holding these in othrt then weight? seems as if i am driving with low air pressure and hit big bump or something there is nothing keeping the cup in. is this just me or is all cool? thanks, pkj