Well, the Rockite job is done and here's what I found. The fore-end was pretty solid to begin with and had very little up and down flex and no large amount of side to side but you can see the stock moving when pressure is applied. After the steel rod and the Rockite installed, I see very little to no difference in the stock. On a rest or bipod, the barrel is still free floated.
What I read before the job, was most of the flex in plastic stocks come from around the action area and thats the part that needs the most attention. What I didn't read is how to fix it.
So basically the Rockite didn't hurt anything other than adding a few ounces of weight, but the rifle will see mostly bench shooting so the weight doesn't hurt.
The freezers full of venison and I'm done deer hunting, so it was a fun project and I found out that while it may help other stocks, it didn't help this one very much and time and a couple of bucks is all I'm out. The rifle shoots good and maybe a little stiffer fore-end may help. Another trip to the range will let me know.