Boofer, Weight and eff mass are not the same thing. If you google eff mass you'll see that computations are complex.
3.5g arm tube weight seems light for the Ortofon 110, but I really don't know. I would think the headshell connector and collet would weigh a couple of grams?
VE publishes mfg specs and eff mass would include stock headshell. There might be some mistakes there, just as there are in the cart database. Once again, if you get a test record you can see resonance without having to get a scope. If you use carts of known compliance and know fastener weight, you can use the calculators to solve for eff mass. Your AT carts 440 (18cu) and Virtuoso (15cu) and Ortofon should average out to a good estimate. Some other hand made carts might vary more from mfg specs.
I looked up the 1300. The description of the motor reads similarly to that of the VPI Classic Direct. The revolutionary design uses the platter as the rotor and the base as the stator. It also has a brushless motor. Earlier designs had the platter sitting on the rotor. VPI has the platter as rotor and a circuit board stator and such niceties as a 20lb platter, massive base and expensive motor and 3D arm. So it's essentially the same, give or take about $29,900?
Joking aside, you don't need a million dollar record player to enjoy a record. If you haven't already added weight inside the 1300, that should go a long way toward solidifying the sound. Non-hardening modeling clay is easy to work and lead is great for slowing vibrations. Just leave room for the motor to breathe.
The Cadenza line gives an interesting view of voicing a cart. Yours has a fine line on an al cantilever. Blue has FG 70/ruby, bronze has tapered al/Replicant and Black is boron/shibata. When yours wears, you could send it to Soundsmith for a level 3 and it should be similar to a Blue. It's interesting that Bronze goes back to al with the Replicant tip. It looks like the generators are the same.
If you're comparing the tables with different carts, it might be apples to oranges, although sometimes you can tell. Enjoy.