Coggan and others have 106-120 pct of ftp so dialing it down to 110-112 doesn't seem wrong at all especially if it means you can get more work done

I believe 110 at 4 mins w 3 mins rest is better than 120 at 3 mins w 3 mins rest and I'm not sure 120 at 3/3 will add anything beyond fatigue and mental toughness