I've never used fresh peppers, only dried, but 4 is probably going to dial up the heat quite a bit. But you de-seeded them which will help. Only time will tell. The lag could be due to many things, we would need more details to speculate why (ie. yeast used, ferm temp, starter or not starter, etc)
As has already been said, you should wait until primary fermentation is done to add fruit, and most people prefer to do it in a secondary fermenter.
I just made a mango habanero sour ale which ROCKS. My preferred method of adding the heat is using habanero powder. It gives me more precise control from batch to batch.
If you got the heat right it will probably be pretty good. I've had mango jalapeno margaritas and they are great.