21317 has ECM done till half t45. If you convert that to a TF depth and use that instead of 67, maybe it will generate reasonable B2?
EDIT: Or realize that asking P95 to generate "optimal" B2 with completely made up numbers like "67,2" is piling nonsense upon nonsense, and instead just specify the B2 manually (say B1*200).
EDIT2: But naturally, this small an exponent should use GMPECM to do stage 2.
Last fiddled with by axn on 20210903 at 04:39
