We have the same problem with bees, although the small crops are usually down to late planting.
Last year we tried self fertile "Firestorm" and they were very good.
This year we tried Moonlight, again self fertile, they are also good although the production of flowers hasn't been as good as I had hoped after the first flourish.
Blackfly put in an appearance about a month ago but I'm afraid I dealt with them with chemicals. as 1Runnybeak1 says, sometimes we need a little help
I am now plagued with a tiny black bug which I can't identify, there is another post about them here......