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-... I'd recommend simply using 100 watt variable Lpads on the horn drivers / preceeded by ( at least ) a 2 pole LC network on those compression drivers. - If you liked the FR curve that a 2 uF cap gives you with a 16 ohm load / then simply double that value to 4 uF for the newer 8 ohm load ( that irepresent an approx 5000 hz F3 point ) .
- Adding in an inductor ( wired in across the line after the cap ) that has a value chosen to work at around 800hz to 1000hz will offer you added driver protection and power handling. Either a 1.6 to 1.3 mH coil ( 16 or 18 gauge ) will offer cheap protection while having very minimal effect on the final horn curve ( since the active elements are more than 2 octaves apart ) .