Id say either the HUDY 1/8 bag or the 1/10 bag both are really nice but super pricey. On yours try putting all the boxes out and re adjusting the velcro shelves, once I did this with my T8 (same as the protek) everything slid a lot better. I also put some duct tape on the 2 bottom draws so that they didnt wear on the bottom screws so bad, and it helped them slide better.
2013/2014 WCICS CTA Champ
Awesomatix | Roche | Trinity/Revtech | SANWA | ORCA