Topping the shocks out is very wild on the big end. look to see at ride height how much shock is showing between the bumper and shock body. If you have 3" travel shocks or near that I never run more than 3/4" of ram showing. I use the travel for tire application not bump which the bumper does plenty well by it self without much shock travel in the bump or compression. If that checks out the next it a broken or weak spring in the front. A scale report will detect this easilly. Excessive preload put in the car will permit the car to behave seeming well under acceleration than wild under decell. Is the driver 500#? Could your car be built lob-sided, are the shock mounts square to each other and square to the rear suspension brackets? If you are within .030" that would be ok.... check these things including tire pressure front and rear too and you should have the problem by the neck.javascript:emoticon(':shock:') I hope this gives you something to start with.