I wanted to say that Renko or Kagi charts use no time-based indicators such as moving averages that allow nice curve fits for everything. They look only at changes in price, just as you did. There are a few threads on Renko charts in the forum, I think.

phoentzs wrote:

How do I get 1,000,000 candles?

You have to open a Premium IG account via PRT

nonetheless wrote:

here’s the 1m bar backtest, run at 08:00 in the UK.

I’ve also played around with this kind of “opening bell” strategy, in my experience the biggest killer is the slippage – can easily be 10-15 points away from the opening value, so the backtest is fairly meaningless.

What you can do, is a correction for slippage. You do all calculations in your live system with the open price of the trade candle instead of the real positionprice. That is, if a long position should in theory (without slippage) open at a price of 10.000, with sl and tp both 50 points, but in reality it opens at 10.010 due to slippage, you set the stop nevertheless at 9950 and the limit at 10.050. Slippage can go one way or the other, but most of the time it cancels out over time, because sometimes it is bad, sometimes good.