I did learn about the default peak of 9 to 18 months and actually spoke extensively about it to one of the reps in LC before I started. The reason I am unhappy is because my accounts in Prosper and Upstart have not been suffering such aggressive defaults at a time when the economy is not doing terrible. I had started investing in all P2P at the same time to get a one year benchmark and then decide which ones to go for aggressive investing.
Thanks for update. What is the interest rate range or average interest rate of loans you are lending to LC vs Prosper vs Upstart? The loans with lower interest rate (better quality/grade) tend to default slowly over extended period of time compared to high interest rate loans. I no longer collect Prosper loan data and didn't even realized Upstart is still in business so can't check their defaults with time. But this trend is quite evident between grades on Lending Club.