Any way to meet code with 40.7% or 40.44% conduit fill?
Derailed by Derating

Your plan is a non-starter, even if you overcome the fill issues you're having, because of the other limit the NEC places on conduit fill; namely, the derating factors found in 310.15(B)(3)(a) that limit ampacity based on the number of current-carrying conductors.  The first two rows of the table are normally not an issue because nobody gets to use the 90&deg;C ampacities of wires straight up for termination temperature rating reasons.  However, staying within those rows limits you to a maximum of 9 current-carrying conductors, and you need a minimum of 10: 3 for the three-phase machine, 4 for the two 208-240V single phase machines, and 3 for the 120V circuits (the analysis comes out the same in both scenarios, assuming we put the 120V circuits on a multi-wire branch circuit in either case).

This means that the ampacity rating of your 8AWG wires is limited to 27.5A by the 50% derate imposed by the NEC due to the conductor count.  Going up to 6AWG gets you to 37.5A, which would be acceptable for your application, albeit marginal.  The other wires are not spared either: the 10AWG wires need to become 8AWG as they are limited to 20A by the derate, and the 12AWG wires need to become 10AWG or else they will be limited to a mere 15A for the same reason.

Even with the fill savings yielded by removing the extraneous equipment grounding conductors and using a MWBC for the 120V circuits, we still wind up needing 3 6AWG, 4 8AWG, and 4 10AWG conductors in the best case, or 32.71*3 + 23.61*4 + 13.61*4 = 247.01mm2 of conduit fill to run this in a single conduit.  Since your 1" EMT has 222mm2 of fill available for you to use, we come to a single conclusion: you must split this run into two separate runs, one for the 3-phase machine + its convenience receptacle and the other for the two single phase machines and their associated receptacle, in order to wire this feasibly using "normal" methods.

There is a tricky way out, though...

There is a way to get this run down to 9 CCCs (and thus to manageable derates), while staying within the fill of a single 1" EMT, though.  If you can run the computer's power supply on 208V AC (check the power supply's label, if it says "90-264VAC" or something like that, then it will run quite happily on any AC voltage within that range), and the two single phase machines do not mandate specific upstream breaker sizes, we can cram them together to form a multi-wire branch circuit, consisting entirely of line-to-line loads.  This forces that circuit to go up to 8AWG wire at a minimum due to the fact we are effectively connecting the loads together in a delta configuration, vs the wye configuration more common in three-phase MWBCs, but lets us run the computer and both single machines off of a single three-phase branch circuit.

As a result, we wind up with 3 8AWG wires for the three phase machine, 3 6AWG wires (why 6AWG? this has to do with three phase power and wyes vs deltas, suffice it to say that the factor is roughly 1.7 times the single phase amps for a balanced load consisting of 3 single phase machines of a given ampacity wired as a delta, and then you have to factor continuous load derating atop that) for the two single phase machines and the control computer wired in a delta configuration across the circuit, and 3 12AWG wires for the convenience receptacles, wired as a conventional MWBC.  This gives us 3*32.71 + 3*23.61 + 3*8.581 = 194.703mm2 of total conduit fill, well within the 222mm2 of available fill in your 1" EMT.  You can even get a 3rd receptacle circuit in there "for free" simply by pulling its hot wire, as then the neutral on the 20A MWBC stops counting.