[Strategy] Mulligans

[GreenOne]

I'm quite good as a combo player, being able to focus on different strategies, knowing when to go off, and seeing easily the paths to victory through the cantrips.

Unfortunately, I never had the mulligan skills.

Till now, I did well piloting decks that are forgiving with mulligans, like DDFT and Solidarity.
Thanks to the high manipulation power of those decks, you can almost keep every hand with some number of lands, some number of cantrips and shape your hand as game progresses, taking in consideration what your opponent is doing meanwhile. When you'll finally combo, your hand is completely different from your starting 7, and often resembles the hand you want to have at that time. The decks rewards greatly your playing skills, but not that much your mulligan skills.

Even with belcher the mulligan is quite simple: look at your hand and ask yourself if this hand can combo right now or the next turn. If it can't, throw it away.

But now, I'm approaching TES, and this deck is not as forgiving with mulligans.

How can I improve my mulligan skills in general?
And how, specifically, with storm combo decks?


EDIT: Here's some literature about mulligans:
The Art of the Mulligan, by Ken Krouner - 2003
The Art of the Mulligan: 8 case studies by Ken Krouner - 2003
Fundamentals: the Mulligan by Rogier Maaten - 2005
SCG Daily - The Kid’s Perspective: Some Mulligan Exercises by Julien Nuijten - 2006
SCG Daily - The Mulligan by Zac Hill
Finding Meaning in Mulligans by Jeff Stewart - 2006
Feature Article - Sixes and Sevens: Mulligans in Constructed by Dan Paskins - 2007
Unlocking Legacy - Mulliganing and Deck Design by Christopher Coppola - 2008
The Philosophy of the Mulligan by Terry Soh - 2005