Hopefully I can help you out a bit. If the Jolt you have is still useable, keep using it until it gets to the point where it is not fixable anymore. I have a No Mercy that has a crack that runs along the pin, but it hasn't gotten any worse for over 6 months, so I keep using it and it works very well for me. This may be the case with your Jolt, it could last another two years, or crack the next time you throw it, it's too hard to tell exactly how long you have with balls that have cracks already in them. So, keep throwing it until it is unusable, that is the first thing to do.
Secondly, I would find another Jolt in the meantime, preparing for the day that the other one finally cracks and dies completely. This way, you already have a replacement ball ready to go, and you know you like the reaction it gives you, so that is one less factor to worry about with the new ball. Just find a Jolt with similar specs and punch it up when the time comes. Don't wait too long, as the Jolts are getting harder to find, so to get one with the EXACT spec's you're looking for is going to get harder the longer you wait.
Thirdly, and this is completely up to you, if you want to update to a newer Storm ball that has similar numbers to the Jolt solid, I would look at the Street Rod solid (as you mentioned, good call btw). This ball has an rg avg. of 2.55 (Jolt is 2.54), and the diff. is 0.038 (Jolt is 0.035), those numbers are VERY close. The Jolt originally came at a 1500 matte finish, and the Street Rod comes in at 2000 abralon, so they are pretty darn close across the board. This is just another option for you to consider, but you may have an easier time finding a Street Rod solid with the spec's you want simply because it is a newer ball in the Storm lineup. Good luck, I hope this helps!
--------------------
James Goulding
Moores Pro Shop
Bowler 2 Bowler Blog: http://bowler2bowler.wordpress.com
State Site: http://www.msusbc-maine.org
Local Link: www.lausbca.org
