Choosing CO2 volume for a frankenstein beer

[spl]

Thanks to some help in this forum I've figured out how to carbonate my corny keg with beer or wine and dispense through a decent bar tap, and it's working great with two successful barbecues down and one to go!

Now I have a Brewferm Cherry Ale ready to carbonate. I brewed it to 15 litres, However I found it a little bitter so I sweetened it with 600g sugar and acidified it with phosphoric and citric acids to produce a mock-lambic style beer which is very nice sampled flat.

Now I'm trying to select a carbonation level using [the carbonation chart here.][1]

But I'm uncertain if I should choose the volumes of CO2 suitable for what the beer tastes like (Lambic ≈ 4) or the type of beer the kit was supposed to make (Ale ≈ 2).

If I choose based on the style I've created and carbonate at 4 volumes, will the beer come out all frothy if it still identifies as an ale in protein content and composition?

How would you choose?

  [1]: https://www.kegking.com.au/blog/post/how-to-carbonate-beer-in-a-keg

[pob]

As it's in the keg, you can try either easily enough.

I would start it at about 3 vols, which may be very frothy if you don't have flow control taps/disconnect or long enough beer line.

If too high then just burp the keg & reduce pressure.