1% stale is no issue.  You are better in this case to have fewer rejected shares.  In the case of the 134/1/81...that 81 is almost 40% of your shares...so 2mhs doesnt help if you are losing 4 out of 10 shares.  I would need to know gpu and oc settings to advise what to lower.  But definetly too high one or both... core/memory.