I don't buy the whole 179 thing. The whole reason behind it is that the Novahawk is considered to be better than most CCH's. I think if we have a balanced CCH-class plasma boat on the other side we can avoid the whole issue. Give the Gorn CCH 2 more points of power and the problem will correct itself.
Gorns are sometimes Alliance and sometimes Coalition, but they are always on the opposite side of the Roms. Make the CCH comparable to the NHK and we have no BPV issues for command cruisers.
The whole "179 BPV" thing was chosen by Lepton, IMO, because SVC himself declared all ships at 180 BPV or above are classified, at a minimum, as a "heavy battlecruiser".
Consider the SFB text for your aforemetioned ships:
R4.72 "This ship is considered a heavy battlecruiser" - Novahawk
R4.73 "This ship can be considered a BCH" - Royalhawk
Both lines are reprinted, in all their glory, in the SFC 1 manual.
Miraculously, without checking the shiplist / MSC, I'll bet you both ships are 180+ BPV. I think Taldren cut them some slack because:
The Royalhawk, with it's 1 R vs 2 S configuration, is potentially "undergunned" or at least "underhardpointed" for the 180+ BPV level. SVC recognizes this potential issue by the differentiation in the text (wishy-washy "can be BCH" vs strict "is a heavy battlecruiser"). The Novahawk was mis-classed as a standard Heavy Cruiser because of either the plasma tracking issue, the fact that the officially "conjectural and unbuilt R-KCR" is "built" in SFC as the Rommie's "official" BCH, or it was just missed as an oversight on the original shiplist work by Taldren.
To make matters worse, we've carried this illusion of the NHK/RHK as a "line command cruiser" on throughout our SFC play for over 5 years.
As an alternate fix, we could take advantage of the wishy-washiness on the RHK and specifically declare it as a "CCH", and noting it as an official exemption to the 179 BPV limit in the rule. Therefore, the Rommie's now have an "official" CCH to counter the Gorn CCH, and all is right in the plasma world. We'd avoid repeating the whole flamewar over the NHK being an "overpowered" CCH that way too...
Because, as an ISC pilot, if you gave our "historical" enemy, the Gorn (ISC's often aligned against the Gorn, I think I've winged with Mirak more often than the Gorn) 2 power for their CCH, I'd request it get an appropriate BPV hike. That BPV hike would, most likely, put the G-CCH over 180 BPV.
Using the existance of the R-NHK, R-RHK & G-CCH as prime examples of "BCH" level ships (180+ BPV) being treated as CCHs, the ISC deserve to get a CCH-class vessel. Due to the awful thin ISC shiplist, the CCY/CCZ are the only currently existing combination of ships that can be reclassified into this position, as they are CCs over 180 BPV made during the CCH era. As this reclassification would leave the ISC without a "heavy battlecruiser" roled ship, and that could cause no end of consternation with the serverkit / missions, I believe the entirety of the ISC would survive with the CCZ retaining it's artificial "BCH" treatment as long as the CCY gets it's YLA adjusted to "end of CCH production", which is, IIRC, 999 along with the CCH classification. Perhaps, if it's absolutely necessary, a new I-CC (CCC / CCB) could be generated to fill the vacant "ISC BCH" slot from 2275 - the end of the Y-refit period(2280-ish). This BCH-level CCY could carry the SFB-official 6 cargo boxes (representing the space the I-torps would be installed into) instead of the Pl-I, granting it 12 extra (doubled) internal hits over the "stock" CCY.