You didn't mention what version are playing, so I am going to assume the Unleashed pack.
92 magmatic engines produce 368 MJ/t. Redstone energy cell accepts 100 MJ/t. Leads to an excess 268 MJ/t.
However, since the entire chain is Thermal Expansion only, the magmatic engines should theoretically detect that the energy cell isn't requesting as much as they're outputting, and throttle themselves down to just over a quarter power. In effect, your 92 engines are outputting as much as if they were 25 engines, but they also only consume as much lava as if they were 25 engines. If the throttling works properly, that is. I've never tested a setup as you describe.
On the other side, a quarry maxes out at 48 MJ/t +2 MJ/t power perdition (this has been independently tested and verified), so splitting 100 MJ/t between two quarries should run both at maximum speed. The 100 MJ/t number you saw is probably what you can input into a quarry's internal storage per tick, not what the quarry will actually use to do stuff. Also note that an energy tessearct has 20% power loss, so while you're inputting 100 MJ/t, you're only getting out 80 MJ/t. Each quarry therefore gets 40 MJ/t, which is enough to run it at near-maximum speed (so fast you don't notice a difference in any case).
If you want to use more power from the engines, you need to go parallel at the bottlenecks. That means: don't feed into one REC, feed into 4 of them. And then let each REC output into its own tesseract too, so you have 4 sending tesseracts in total. You can set them all to the same frequency without problems, and they will combine their throughput. Then you can also connect multiple receiving tesseracts to the same frequency to get the power out. You'll need at least 4 (the same number as sending tesseracts) to get it all, but you can have any number larger than that and the power will be split and go wherever it is currently being requested the most.