Welcome Rick......looking forward to seeing your work too. Building/restoring them and promos is a life long passion for me...being disabled its a great way to pass all the time and keep the mind active.
Maybe your letting it get too hot or too cool yet..? Usually if your careful after heating it up so it can be stretched while gently pulling the plastic blow on it and you can learn to control the shape. I have used sprue for years to make my own fine tipped detailing paint tools and other things.
Id love to post some...but I need a system that is so easy its for a person that has never used a computer before. I always have to talk a buddy into doing it for me...otherwise Id even send you all some photos of the tornado that hit here on the 13th of last month. I have tried but just cant seem to get it right.
I was cleaning what the tornado did in my model room and found that one of the models a family gems box was crushed...;.got it open to find the kits body is fine...good time for good news for a change...