I use AvGas quite a bit for the high compression BB. It is relatively cheaper compared to race gas, lasts forever (no ethanol breakdown). What I find is that when it is very warm out, it can idle a bit wonky (I have a stock 11:1 L78, all timing in at 3k). A splash of 93 can help there as you did. I also find that if you are running a stock Holley, it needs to be squeaky clean. I regularly pull the idle screws on the metering block and blow the idle circuits out with an air blast (Thx to Eric Jackson for that tip), change the brass filters regularly as well. With all that, my engine responds pretty well with AvGas
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70 L78 Nova Fathom Blue,Bench, 4spd, F41, 3:55
71 Porsche 911 Targa
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