I'd have a little heart to heart chat with these guys just out of ear shot of the rest of the shop.
I've had guys breeze through here too, and I want our guys to understand that what I preach to them about quality is for real and outside inspectors expect to see quality work.....when guys breeze through without looking at anything, it underminds our sense of quality and what is important for us to produce a quality product. I'm with you when you say that you want the inspector to make you tow the line and expect for your guys to do things correctly.
I have also outside inspectors hold us to their idea of how to do things rather than by the applicable codes or standards that we work to which is a different problem altogether.
Seriously, have that chat and tell them not to gloss things over, and to get in there and use that extra set of "outside" eyes to help you discover any weaknesses in your program.
BTW, I'm a CWI as well and don't like the idea that other CWIs are making the rest of us CWIs look lazy or shady.