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If you put weight in the Frunk, you will be adding load to the front tires and likely increase understeer rather than reduce it.
For the tiny amounts of understeer a C8 has, you can try some front tire pressure changes {-2PSI, -1PSI,+1PSI,+2PSI} to see what feels better.
I agree. To decrease under steer you need to change tire pressures, wheel alignment and if really ambitious remove weight from the front of the car. Here are the general rules of thumb needed to address Understeer and Oversteer. Be careful reducing understeer in a street car. Especially, a mid engine car that has had understeer dialed into it by the manufacturer. Understeer is far safer than Oversteer and GM learned a painful lasting lesson about producing an oversteering car 55 years ago. The vast majority of drivers including so called aggressive drivers don't know how to drive a car that has oversteer characteristics. Porsche learned that lesson very well back in the same time period although not as publicly as GM did.
^^^
Yep with my modified '67 Corvair; moving the spare tire from the engine compartment to the frunk, with Plus1 14 inch performance radials, using GM's recommended 16 psi front tire pressure to promote Understeer and setting the rear "toe-in" at the max within their 1/4 to 3/8 inch spec to help steer the rear in high "g" turn, was not enough to eliminate all Oversteer. With 60% rear weight if going to fast for a turn and going into a slide you had a fraction of a second to turn the wheel as Tony Stewart is doing below in his sprint car on a dirt track..
Just the opposite and unnatural if you're used to driving a normal Understeering car. In fact, like Tony, had to be prepared to turn correctly just before the rear broke lose to get max speed. Was fun as it was for Porsches back-in-the-day but not something the average, as you say even aggressive, driver knew how to do. Takes anticipation, knowing/feeling what is too fast and practice! That's why Tadge in that 1 hour Autoline Video Interview (who said his Dad drove his Porsche at the limit) that when they were designing the C8, Oversteer was his "biggest fear." As he also said in another interview it took Porsche decades to design their ~60%% rear heavy 911 to avoid the issue! He ended with we were able to do it!
