Those are some good ingredients for sure! You might want to use the rocoto paste for your ceviche. I almost always use aji limo for ceviche, but honestly any hot pepper will contribute to the flavor profile of a good ceviche. I've used rocoto plenty of times in the past for ceviche, and it came out well.
That aji panca paste you got is very versatile! I use a dab of aji panca for many beef dishes, whether grilled, sauteed, or roasted.
Aji panca is the one staple Peruvian pepper I don't grow, even though I cook with the paste all the time. I guess the reason is that I have never seen a recipe, or tasted a dish that calls for fresh aji panca.
BTW, if anyone lives in the NE, and loves Peruvian food, there is an annual Peruvian culinary festival in DC. I've gone the last 3 years, it's awesome. They have every kind of Peruvian food you can think of from food vendors, plus every major pisco vendor from Peru shows up to serve pisco sours, and sell bottles of pisco. Famous Peruvian chefs also come out to teach classes on how to cook iconic Peruvian dishes.
Tasteofperudc.com
Last year they even brought out el Ninja de los limones from Peru to perform, who is one of the most well known cevicheros from Peru.
The anticuchos and chancho al palo last year at Taste of Peru were the best I've ever had. Finger licking good!!!