I hear you ... (I switched, many years ago, from spot forex to forex futures so as to be able to use volume, and my results also improved significantly).
Just a word to the wise, Padu, about VPA and spot forex: you need to remember that "volume", per se, and anything dependant on it, simply doesn't exist for spot forex: it's not a centralized market and there's therefore no way of monitoring volumes transacted.
Some spot forex "brokers" provide what they call "volume", but it's only their own volume, and there's absolutely no reason to expect that it's representative of volume in the interbank market.
I'm not suggesting that you shouldn't use VPA (of course!), but maybe you should take it with a pinch of salt? Investopedia estimates that the totality of "retail" represents less than 3.5% of forex volumes. (I don't know how they measure it, and I don't know whether it's true ... but it wouldn't surprise me at all, if it is.)
I'm "just saying" ...