The Laffer curve is nonsense. it was just a vague idea sketched out on a napkin.
It's been looked at closely and best estimates say that if the theory worked then the optimum tax rate would be around 70%, but it's a big if!
https://en.wikipedia.org/wiki/Laffer_curve
You are right about the indirect taxes being a burden. They have the result that low paid earners can end up paying a much higher % of their income than the much better off, as the less well off spend a greater proportion of their money on taxable items - necessities - it's not all fags and booze!
Lower VAT, NI etc, balanced by higher top rates 70% or more, could be fairer and bring in more revenue.
Tax certainly looks like the answer!
And there isn't another option.