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It sounds like you are doing HO. I have the Rivarossi heavy weights and substituted the McHenry spring knuckle couplers(443-52,53 & 54) the easy way out versus the kadee #s 505 & 508. I never had the uncoupling problem with horn-hooks. My problem was I couldn't lift one car up, without taking a second car with it. Unlevel elevated track will cause the knuckle part of the coupler to climb vertically and therefore disconnect. Also, if HO, the Rivs may be 11 1/4 " long compounding your problem on 18" radius track. You have problems going forward, you will have more going backward A conversion over to another coupler may not resolve your difficulity because of the above reasons.
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