I had similar problems these past few days. Found 5 blocks in the past 36 hours again, but only got rewarded ~100GRC.
I still don't know how this Wallet hour work. If I am not lucky and no other blocks are found during the same wallet hour in the past 36 hrs, will I eventually get the payment of 100~ GRC for each block found (My BOINC utilization is 90% all the time)?
Most of the users know this but I reiterate : You still do have to find one block before you are in the integrated pool list.
Wallet hour: You should be paid multiple times during your wallet hour; one share every time another poolminer finds a block in your wallet hour. It is possible to have an 'unlucky day' when users don't find many blocks in your wallet hour but it should average out. You can audit this by checking the boinchash for found blocks during the unixtimestamp range of your wallet hour for the previous day.
Grid
PS I have one poolminer running and received 4 payments last night - I believe they were 80grc each ; fyi.