What is the min. recommended value to be away from the PWM limits of other modes?

Even though the Flight Modes will switch within the Mission Planner, I have found during a test flight a couple of my mode values were too close to one another.  I realized the issue when I played back my tlog. There was only 6 digits between the 3rd and 4th modes, even though the PWM was within the limits of each mode.

I now have my values at least 20 digits away from the limits of the next PWM mode/s.  Will 20 digits be far enough away from subsequent mode's?  

I assumed if the modes switched within the Mission Planner (- within their range), everything was okay.  To my surprise, the unstable flight and playback tlog said otherwise.  Note:  The tlog showed my mode 3 (Loiter) and mode 4 (RTL) going back and forth until I switched back to Stabilize mode.

I will be testing, and hopefully correcting the problem tomorrow.

Thanks in advance.

2013-08-17 13-44-57.tlog