You see, that is exactly why I think the logi suit in general (disregarding the caldari bonus) is a bit too good when fitted straight for combat.

Let me lay down some more numbers to compare the caldari assault and logi in terms of fitting. Let's assume max skills for this, and we start of at:

Assault: 390 CPU/78 PG, Logi: 507 CPU/101 PG

We already know: fitting 4 shield externders on the assault and 5 externders on the logi leaves both with almost equal EHP:
Assault: 703 (553 shield/150 armor), Logi: 700 (588 shield/112 armor)
Substracting fitting costs for the externders (cost 54/11 each), we are down to:

Assault: 174 CPU/34 PG, Logi: 237 CPU/46 PG

Assume both are also fitting a duvolle AR (should cost 77/10 at max skills) their remaining fitting capacities are:

Assault: 97 CPU/24 PG and 3 lows, Logi: 160 CPU/36 PG and 4 lows.

And if you take into account that the logi has 5 HP/s built in reps, for which the assault needs to fit an extra complex armor repper (costs 45/11), both are standing at:

Assault: 52 CPU/13 PG and 2 lows, Logi: 160 CPU/36 PG and 4 lows.

That's the problem right there, because if you ask me, giving up the side arm and a tad mobility makes up for that large fitting bonus any time. And these numbers apply similar to the gallente suits, which have the same numbers with an inverted high/low slot layout, and to the minmatar (where the CPU/PG difference is a little bit smaller).

A few notes here (some of them questions)

• Are the SP totals needed to hit required/max skills for both of these suits equal?
• What is the ISK cost disparity between the two fits listed?
• How do the above change if each suit/fit fills the rest of it's available slots?
• What about the Minmatar 1 HP/s built in rep bonus on the Assault?
• How does the inclusion of the +25% shield recharge rate effect this comparison (please include it as it is the counter part to the 5 HP/s Logi bonus that you have already included). Enhanced Shield Recharger; 1 High Powered slot; 60 CPU,
3,615 ISK

• How does inclusion of the Scan Precision differential effect your comparison? Basic Precision Enhancer; 1 High Powered slot, 15 CPU, 825 ISK. <-- This is the mod required to equalize with the Assault base value, note that as a % based mod an Assault suit running the same thing would gain more benefit.
• Basic Cardiac Regulator; 1 Low Power slot, 5 CPU, 4 PG, 720 ISK or Basic Kinetic Catalyzer, 1 Low Power slot, 15 CPU, 10 PG, 675 ISK One of these mods is required by a Logi to compensate for that "tad mobility". Either mod will give an excess in it's related state and a remaining shortfall in another, resulting approximation of equalized movement is one mod.
• Please replace the AR in your example fittings with each other Light Weapon, then assess sidearm value.

Looking forward to seeing your response to each of these items.

Cheers,
Cross

EDIT: here's CCP Remnant on the subject, of suit roles.