I'm able to answer parts of your questions.
Yes, of course there are.Are some guns more sensitive to limp wristing then others?
Bone structure and keeping everything in line helps. Locked elbow for the weak wrist IMO. Holding the gun tighter is good, but fatigue will set in faster. Take frequent breaks with range time and asses what's going on. Many 'carriers' are not avid shooters or involved with shooting sports or regular range visits. Those pretty much demand special care and prime time education since practice is limited. Those who shoot often become more comfortable and adapted to their firearms.How exactly do you explain to someone how to correct limp wristing?
In any equation with a means to an end involving science or mechanics.....there can be problems. What our human minds can do is eliminate the possibilities by changing things conditional or environmental, and this should be done one step at a time. The first step with any break down of the human mechanical interface should be assessing ourselves and how we operate with the given mechanics. We are able to change more and adapt to the tools we use. If we are unable to adapt to our chosen tools, then we should choose different tools. Our tools may be adaptable to a certain extent, but consider the factory firearm and it's mechanics to be the best available to the largest percentage of the firearm using population. Change one thing at a time and you'll get there. Change two things at once, and you'll be dismayed for a long time. Change everything at once and your down the road to the unknown and forever fighting your way back to where you began.Could ammo have been a problem?