Ah-ha... I didn't think of that one... :o

If you've got 10's now instead of 9's you can resolve the problem in one of two ways:

1) Remove the 10's and fit 9's instead
2) Add another spring to the back of the trem block

And those are the options. Sorry, I just assumed that you'd fitted the same gauge that you took off...

And on stretching the strings in, I do the same as you Krunek - bend the strings up from every fret between 3 & 15ish and go nuts with the bar... retune and repeat...