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Advance
Ther is no real baseline for advance versus compression. The theory that higher compression needs less advance is true in the big block but every motor will be different. This is for many reasons that have been previously explained to me that I could not begin to repeat.
One of the ways that I have found the easiest is to get right is make changes in 2 degree increment but, most importantly, read ALL the plugs for detonation. Due to the exhaust configuration, the back plugs will read different than the middle and front. You should try to get to the limit of no detonation and a trace. Then check again on colder days. Colder air is like an automatic timing bump.
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