Before you go completely back to the drawing board, you can try to adjust your parachute settings. First, take one of your parachutes (use a drogue chute first if you have one, otherwise go with your largest one) and have it deploy at the maximum altitude on its slider. Then have each additional parachute deploy in 100-200m increments lower altitude (depending on how many you have total). Then as you descend, target the first parachute and watch the part that shows whether it is safe to deploy and pop it immediately once you see it is safe. Your parachutes will semi-deploy all at once (you haven't changed staging), and then they will fully deploy in a staggered sequence.
By starting at a higher altitude you reduce the strain on the vessel because they deploy in thinner atmosphere and by staggering the chutes it breaks up the total deceleration into smaller events.
It may not work based on your design, but it's worth trying before you go back to the VAB.
