I suggested long ago to take the higher value of either willpower, intel or str to calculate hit chances with CC on healers.
This would be in line with tanks as well, who have to raise str to more reliably hit with their CC.
Overall the result would be higher CC hit chance for those who invest more into offensive attributes or willpower. Chars which put all points into defensive attributes will therefore have lower CC hit chances.
This would help all healers.
The rp/zeal mechanic is used as a bandaid to apply CC. Without it the failure rate is too high.
It's a joke that only dps spec healers can reliably use their CC.
With my proposal full willpower healers would have similar hit rates compared to dps spec healers, both are squishy, so there is some balance.