A 6' glass rod would be perfect and load up ideally for your waters. Here's a link you might want to check out. Lamiglas e-glass.
Custom Fly Rods, South Fork Rod Company manufactures the finest fly rods
Dave Redington's new company. If you have the time build a blank up. They sell them too.
Graphite is just not soft enough in a 6' length. With the Griggs you've already found that out.