One thing I have heard others say but I have not personally delt with, is that if you have a cable driven rest and change draw lengths or mods you may have to have your rest re timed due to the cables pulling different.

 

I have had to retime on my trx with different letoff mods but not with dl changes
I have changed my vertix weight dl and let off and not had to retime
any time you change a mod spec you should plan on re tuning and retiming you may get lucky and not have to
and yes a change in timing or dl can affect a cable driven rest so make sure you check it

 

I know you have heard this numerous times make change, any change you will make adjustments to your tune. Some large, some small.
To answer your question yes.

 

Yes. Re tune every time you make a change. Better safe than sorry.

 

Yes. A module change will require another tune. Usually very minor.

 

How feasible is it to have a hunting setup tuned to shoot fixed broadheads at say 75#, but still have a reasonably good tune for 60# mods shooting a (lighter) target arrow?

I assume matching arrow OD and playing around with tip weight would be the best way to match things up.

Might be a good reason to go to a limb driven rest too…

 

Why not just set it up for hunting at 60# and not mess around with it? Then you will save money, time and have more time shooting.

 

I went from 70 down to 55 now at 65 while I worked my torn bicep back up. I kept draw length and let off the same. Arrow and tip weight also unchanged the only real difference was poi high or low with my lift left and right did not shift for me. I got new strings and cables and I screwed another 20 grains into the front of my arrow for hunting setup, that was the first time I had a left or right movement in my sight.

 

echoing above - yes, retune likely. Rest timing as well. Also may change your cam sync.