One word about growing peppers: cross-pollination. OK, that's probably 2
I grew some shishitos that crossed with my red bells. They were the gnarliest but best tasting red bells I ever had. Didn't get any seeds from them though.
I sprout the seeds in rubbermaid containers on paper towels and then when germinated I poke into 1x1 peat pots. They're called Jiffy strips. yield in the peat pots is 100%.
For increased yield prune the plants. Mine grew tall, spindly and had branches break off under the weight of the peppers. Knowledge: too little too late... bummer.
good luck in the new growing season. Some guys post garden threads that are nothing short of amazing. I seriously envy them.
ahh another believer in 1st generation affects of cross pollinated fruits, doesn't happen, if you got wierd bells it was from those seeds not your hot peppers grown nearby