Is string is not a string when it comes to bows.A good string is quality built,near perfect in length,Serving size is important which is your issue,serving length from where it starts and ends,strand count of the string,silencers used,loop size, and tie on nocks or crimp on brass nocks.The other choice is material.Of which their are many choices.Contact a stringmaker and work it out.He may want to know what type of nock you use so their not to tight or too loose.I would rather have tighter than looser personally.Especially if I was new to shooting and having issues with relaxing the fingers during the draw of the bow.A claw type draw hand so to speak.You don't want to dry fire the bow and blow it up.Its hard on the bow
I would look at the Venders list for stringmakers.Then contact one or 2 and let them help you build the perfect string for your bow with their advice.They will need measurments of a few things from you.
Your bow will shoot better with the right string and be safer as well.
I mostly have used SBD Silent but Deadly Bowstrings and 10 ring bowstrings.I think their both in the Sponsers/Venders Section if you take a look.Thier are other very good string makers as well besides the two I mentoned.