What a great experience that first solo is. The fear and adrenalin creates a great feeling especially when it turns out positive as yours was.
Even though the first is the best, the pants will still get a little bunched up before you go out by yourself for sometime.
I went through the same problem with having to make some modifications as my boat was not set up for single handed sailing either. It took me about a year to decide on and make them, but what a difference it made.
Good luck in your adventures.