chopping and barrel breaking are two different critters with slightly different symptoms and causes BTW. a chop is when your bolt impinges on a round before it has droped into the chamber with the tippman 98c this is most likely to High rate of fire while relying on gravity feed -, that get hung up before they roll into the beach try a mechanical feed assist hopper, and check your paint for out of round or swollen balls. a barrel break is when firing stress on the ball causes the ball to self destruct in the barrel - both are bad news
generally a chop will leave a large amount of shell and paint in the breach - a barrel break generally does not... USUALLY this is a good indicator if your problem.

If it was the bolt chopping paint thats a hopper issue - you need mechanical feed assist when shooting with R/T rate of fire
but if it was barrel beaks with a flatline for the the 98 thats normal... - I had one with a flatline on it. it is imperative that you keep the BPS down with a 98 flatline. quick 3 round bursts work ok - but trying to empty your hopper as quick as possible is a BAD idea -even with top quality paint.

the A5 flatline is a different animal - since it's a good 2" or more shorter, you can blast as much paint through it as quick the cyclone will feed it
I have R/T on mine and when I sweet spot full auto it I can blast 30 balls out of it in about 2 seconds with never ever a break. (the only time I've ever had a break in the barrel was using some inexpensive field paint cause I couldn't find a case of marbs the day before it was bad enough that I put my LAPCO bigshot on there to finish out the day. the field paint worked fine in the bigshot at high rate of fire. - use marbs in a flatline and it'll make you HAPPY.. I've shot probably 100 cases of Marbalizer over the years I regularly played and IIRC - I've never had my A5 chew one up. (it's good stuff, but it's like shooting nickles at people. you learn to be a paint saver at $.05 a shot. so I figure you'll be keeping your rate of fire down quite a bit with the flatline on it) besides if you can't hit a dug in guy with 3 -5 balls what makes you think you can with 30? Confucious say: Accuracy by volume leads to light wallet.