I'm sorry to say that these studies don't support your argument, as both Hip and I have been carefully trying to explain.
The first paper you cited is an in vitro study which used succinic acid concentrations up to 25mM. Hip previously calculated the approximate succinic acid dose required to reach such concentrations on page 1 of this thread:
If 6mM concentration requires 57,000mg doses of succinic acid, then the 25mM concentration used in the paper you cited would require 237,500mg doses. These doses are thousands of times higher than the doses used in your protocol, and far higher than any safe dose that a person could take.
Many compounds can overwhelm natural balance and enter cells when applied at unnaturally high concentrations in a petri dish. However, those studies cannot be assumed to apply to doses that are 4 orders of magnitude lower.
Multiple studies in humans show that the typical range of succinic acid in the blood is between 2uM and 20uM, which is nowhere near the up to 25,000uM concentrations used in the study you cited. This is noted in your second link above.
Second, your citations about the SLC-13 transporter also disagree with your claims. As we've been explaining, the transporters you're citing are used for moving succinate out of the mitochondria, not into them.
The second link you provided has a diagram and a section which explains this:
and
The SLC13 transporter transports succinate out of the cell, not into the cell. The dicarboxylic acid translocator transports succinate out of the mitochondria, not into the mitochondria. This is information I'm taking from the exact citations you provided above.
We've been patiently reading your writings, your linked studies, and your citations in multiple threads and responding with valid concerns. At this point even your own citations are not supporting your claims, as I've outlined above. I hope that others reading this thread can take the time to read some of the careful critiques of the claims being made here.