i find that 2c>3c works well against all guardpoints, esp since 2d, the guardpoint that quards everything till the first active frame can be hit by a low, and everything else gets interrupted by the multihit
2c antiair is a must, but other than than i dont know what else to say to help lambda out since i literally just faceroll and do whatever i want after air dnails and just get in there
yomi 6d is a bad idea though, i caught a ton of people guessing that i would iad towards them for a free fatal 3c