Sweet Bell Pepper Problem

Not really a problem I suppose - a query

I've been growing bell peppers for years but they simply aren't as good as shop bought ones
They get a decent size but there is no flesh on them - bell peppers are supposed to be thick with juicy flesh but mine are very thinly fleshed which makes the skin seem almost tough

Any ideas what I'm doing wrong??

They are simply dry. A lot of vegetables are a great part water. To grow good fleshy peppers, you ideally need to soak them just about daily.

This is the same with greenhouse grown and outdoor grown (same varieties - 'Bell Boy' previously, 'Jolly Rosso' this year?

They seem to be ready but they are all green - am I picking too early??

Thanks in anticipation for your advice and counsel

If you want them to keep cropping, you need to use/pick green and half ripened fruit. Once they turn red, they start to grow seed.

Varieties can be very differently behaved though. I'm not growing bells. It's a commercial product. I like to grow more natural varieties. So I'm not much knowledged on them in more detail.

Well I had red pepper risotto on Friday with home grown peppers  (yummy by the way!)

Can't remember the variety it was in Wyevales 50p seed sale last year.

I have 4 pepper plants, 3 decent ones and 1 rather poorly one.  They have been in a cold frame type grow house outside (I don't have a greenhouse) - the roof has been hinged open all summer though as they grew too big to close the lid.  They are a little cramped in there... but I spy qutie a few turning red which is very exciting for me as this is the larges success I have had with peppes. I've not really counted how many there are on the plant or how many I'm lightly to yield before the plants sucum to the cold, but I'm happy with what I have 

However quite a few of my peppers have brown patches on them?  Does anyone know what the cause is?  I just chopped around and used the rest of it anyhow...