Barath, if you look back at the start of this thread, you can follow the first DSGed Lemon Zest that was grafted in June. It took less than two weeks to push and flushed multiple times before the end of the year. The frost has killed back some of the newer growth but the trunk now in February of 2016 is about 1 inch wide already. Also note that I have the absolute worst soil for growing mango, solid clay and rocks. Here is a picture of the trunk of my original DSGed Lemon Zest.
Barath, I would keep up with both your single and DSGed trees. We need more data points. If the majority of your DSGed trees are slower in growth than your single rootstock trees, there is probably an issue. One of the seedlings may be injured and can die. DSGed trees should grow at about twice the rate of single rootstock trees.
Something to consider is the timing of your grafts in order to maximize the amount of time the grafted trees get to grow during the hottest months here in SoCal. Lookin back on this thread, I grafted in June but knowing what I know now, I'm going to start grafting in April this year if possible. The major issue with grafting this early in the year is that many trees still have blooms or fruit holding so scions will be difficult to obtain.
It would be great if everyone testing out DSG can post the good and bad of your experiments so that we can all learn together and determine if this technology truely is the next transformative advancement for backyard Mango growing enthusiasts.
In case anyone is interested, I am also working on multiple rootstock technology on Jaboticaba and Lychee with Lucs Mexican Mangosteen in the near future.
Simon