I get good results with with my DynaVibe... after I got thru the learning curve.
I usually target 0.03 IPS but have settled for 0.05 IPS on some jobs. Even at 0.05, the owners rave about the difference in feel from their props. The process I follow is:
1/ Do your runs at a consistant RPM that is leaned for smoothest operation.
2/ Do your run ups in an OPEN AREA, do not try to do the balancing in between buildings, I found that harmonics echoing back off close buildings screw with getting good or consistant results.
3/ First run up- find the heavy spot & note the RPM, degree position & IPS reading. I install what I figure is too much weight opposite the heavy spot, on next run heavy reading will shift 180 degrees from original reading.
4/ On progressive runs- I reduce the installed weight in small increments till I achieve lowest IPS reading before the readings begin to swing towards a different degree angle- This is usually my best result point.
Some engine/prop combos will produce vibrations that you just can't balance out, variables being: baffles, spinner(!), exhaust, uneven compression, uneven engine mounts, or what ever.
The brackets required will vary with each different engine, I fabricate them out of 1'X1"x1/8 steel angle about 4" long.