Come to think of it, I ran into this exact problem for a power amp design I did back in the '80s.
I designed a modest 35W continuous power amp with a short term boosted tracking power supply, that allowed me to put out 2x the voltage swing, or 4x power- 140W, on transients (AMR PMA 70+) . The difficulty was only opening up the boosted rail when the signal was close to clipping for good efficiency, but getting the boosted rail open fast enough for fast transients without clipping the leading edge.
My solution was adding some HF lead in the side chain, so it would respond quicker or actually over respond to HF... I suspect you could do the same thing in your limiter by boosting HF in side chain... You will get too much limiting for pure HF tones, but they don't occur very often in the real world.
JR