This is a common side effect and that is why lipids are monitored closely on this drug.
Please get back to me if you need to discuss this some more.
To be honest its your call - as a 35 year-old male the prospect of you actually coming to any harm from your TG level over a course of treatment is very low indeed.
Sounds though that you would be limited more by the GI and muscular side effects?
In answer to your specific question there is no particular level of TG that would be "OK" before restarting the medication - once you went back on it the levels would just start to climb again.