Chevy43,
A lot of guys get a new airplane trimmed on it's first flights to fly straight. Then they (we) spend the rest of that airplane's life trimming it to fly better and better. And one of the things we do often is to detune or de-sensitize the elevator.

A model only needs enough elevator deflection. More deflection than "enough" only puts the model at risk.

Once I got the CG pretty close to right, I work on either increasing or decreasing the elevator throw. I like to find out if it's too much by doing just what you stumbled into. Only I take her up high to do it. I do reverse immemalmans flat out. Fly inverted and PULL FULL UP. If the plane is going to highspeed stall, it'll do it for sure at the bottom of that half loop. If it does, I back the elevator throw some. When my jamming elevator won't stall it, I then try to get it to snap. If it will still snap, the elevator throw is good to go.

You want enough deflection to fly the airplane into all the manuevers. More than that and all you've got is a harder to fly airplane that is also more apt for you to lose.

BTW, do the adjustments to the airplane's rigging. Leave your computer radio at 100% settings for the servo throws. That way, the servos will be working at their advertised speed and power, not slower and weaker.