It's a bit of a problem. 1.337% sounds a bit low, the real APR would be higher because of compounding, and 13.37% sounds about good but generates a lot of new coins, too many quite probably. Maybe a compromise. Go for 1.337% but add a fixed block reward of 133.7 on top. With the current weight it should roughly double the rewards of an APR of 1.337%. With more weight/coins on the network the rewards would be less because your amount of coins would stake less blocks and only the APR half calculates the higher coin age into the rewards. Causes the lowered APR that less people or coins are staking the reward raises due to more blocks staked the fixed amount becomes dominant, plus some compounding effects on the APR part.