Higher average income earners get relatively less back (double your salary and taxes paid doesn't double your benefits) so it shouldn't make the problem worse. Optionally, the cap could be removed to extend solvency while changing benefits to not increase for those earning over the current cap.

If none of this is to your satisfaction, an alternative of increasing social security taxes by ~3.4% would extend full solvency of the program to around the year 2100.

Also, who pays 60% taxes in the US? IIRC, the highest income percentiles tend to pay around 20-25% in effective federal income tax rate after accounting for deductions and other creative accounting. I doubt between social security taxes (capped to no longer have income taxes after $160k), state taxes etc, almost anybody pays nearly 60%. Removing the cap would make it so social security is no longer a regressive tax where higher earners pay a lower percentage of their income.

Or get rid of the cap where you stop paying social security taxes on income over $160k. Seems preferable to making people work even longer in their later years