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Curtis,
That is easily one of the toughest rivets you can attempt to shoot.  It is
also one you would most like to have done correctly... so you can sleep at
night.  Or while you fly.
I found a long rivet is needed, ie., over 1.5 dia extending thru to allow
for the swell inside the fitting.
A tight hole is also necessary which precludes drilling out a bad rivet.  It
must be done correctly on the first try.  I use my rivet gun and a large
bucking bar and stop after the first few shots which form the bucktail head.
One may then straighten the rivet with a light hammer and a small punch.
Having done that, I continue to shoot in small bursts, straightening if
necessary.  The result will be an acceptable bucktail.
Filling the fitting with micro is a good idea and will help.   Use a step
drilling process to get to the final #30 drill.  Start with a #40 and then
let it out to #30.  Secure the control rod in a vise using  padding to have
it held securely in position for riveting.  When everything is OK blast
away.
Pop and Cherry Max rivets are not approved by the FAA for this application.
Only because you are experimental will you get away with it, but your DAR
will give you a sideways look when he sees that.
I wouldn't go there.  A loose rivet in a control tube is not a nice thought.
Best luck.  Accept a funky head rather than drill it out.  There are a
number of tricks to make a bucktail head look good.
Walter Dodson


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