Thank you for you very competent comments.
Welcome.
I claim that an Rx480 does 105MHkey/s on 01 target and 85 MHkey/s on 2,749,473 targets (compressed only)... draw you own conclusions. This is no BS.
1. Most abandoned wallets are uncompressed.
2. If speed with one address is almost the same as with 2.7M, then you haven't found right values for -b A -t B -p C
No other options.
Most abandoned wallets are uncompressed .. you are certainly right.