I can't give advise on the interlink because I only use 1 unit....
I can tell you that I normally slow troll for crappie at 0.2-0.6mph and I get great images....with a chart speed of 1....
It's all about matching your chart speed to your boat speed so that the images are not stretched (chart speed too slow) or squashed (chart speed too fast)....
The only issue with the Xdicer on the TM is the images will skew on the outside edges when you turn the TM,,,