Long Term Proxy for HYG for Backtesting?

I want to backtest a long term strategy trading HYG (high yield bond ETF). However, HYG's history is too short for backtesting.

I am looking for a long term proxy for HYG, such as a high yield bond mutual fund, but I can't find any good ones that have similar performance like HYG.
Most funds, such as VWEHX, perform quite differently than HYG and usually outperform HYG by a large margin over the long term.

Does anyone know any high yield bond fund that exists for a long time and closely tracks the performance of HYG?

Thanks.
 
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