Hmmm. I found 645160797731449 | 4847*2^8799543+1 through P-1 and it was a bit disappointing to see it was already sieved...
May be it's time for me to move 49 (~563T) setting to something like 49.2 (~647T) to match with 98% sieve point..
Any suggestions?
Are you all using 49, or anyone using other cutoff point?