Glad to hear you upgraded the woofer! I suppose the improvement is substantial over the ME150H!
Active is not necessarily expensive with DSP plate amps (hypex and the like, with an autoformer to lower hiss and noises on the compression), and the H9800+2435 would sure benefit from some specific EQ.
Looking at the S9800 spinorama the axis/window/power curves are very well matched, and even a simple global stereo (digital and parametric) EQ would probably already bring good results.
Here is an experiment I made a few years ago, based on the EDS curves (with unknown passive adjustment settings), showing the effect a proper EQ of the listening window curve (à la M2) would have on the spinorama.
without EQ (simple transcription of the EDS spinorama) :
with EQ, targetting a flat listening window curve:
EQ settings, 12 constant Q parametric EQ points: