It occurred to me that a behavior patterns in pears growing in very hot climates should be pointed out. It probably says a lot about how a pear is likely to respond to summer pruning down hear. Early fall pruning might be more the way to go. Anyway let me explain:
Many if not most pear varieties harden off and don't grow new growth when daytime temperatures are hanging out in the high 90s and hundreds. The fruit will grow and ripen of course, but the trees them selves are pretty inactivate, at least above ground. My guess is that the roots are actively growing in search of water.
In SE Georgia our pattern is as follows. Things warm up enough for European pears to start blooming in late February and really bloom out in early March. Conditions are usually pretty moist through April, and then dry off and heat up a lot with May and June usually being hot dry months. Typically the pears will go through a growth spurt right after they bloom then rest a bit when their growing tips turn black. I don't know if its fire blight causing that, but it happens every year and no major harm seems to come of it. They will then do another growth spurt in April and early June. This is when the aphids attack in droves, and I'm constantly fighting them on my smaller trees. As we go into late June the young branches harden off until the August rains hit, which we did not get this year. This summer was hot as blue blazes and dry in SE Georgia. It was our hottest summer on record, and it got hot early so non of the pears grew for as long or as much as they usually do.
Ordinarily when the August rains hit and start holding daytime temps in the mid 90s range the super low chill pears will bloom just a little bit and most of the trees will start growing again. At this time the aphids are gone, and whatever turns the growing tips black is gone as well, so this is a time when the trees gain a lot of growing mass. This year our August was hot and dry and very little growing was done except by Golden Boy and Tennosui. In September everybody begins to harden off again and the leaves start looking tragedy and you can generally tell the trees are getting ready for dormancy which sets in towards the end of October / early November.
My guess is a June pruning might stimulate the tree to bush out more in August, but I don't know that it would necessarily reduce vigor. That may be better accomplished in early September just after daily showers stop.
To add a wrinkle to the whole thing is that both my Ayers and Shinko basically went dormant in our extremely hot and dry August and have broken dormancy now along with a fig tree after two tropical storms passed through bringing badly needed moisture and cooler temperatures followed. Ayers bloomed out last week and Shinko is in full bloom even as I write. Both are putting on new growth as if it was March. Hopefully fall will be long enough for the new wood to harden before we get a hard freeze.
As for commercial pear orchards, South Georgia had orchards full of LeConte pears up until refrigeration was invented. Back in the late teens Georgia LeConte pears brought a high price in the NE because they came in earlier than the local pears there. With the advent of refrigeration, trucking, air freight and irrigation, the west coast fruit industry pretty much killed the Georgia fruit industry, except for peaches and melons. I don't know that we have many well investigated best practices for growing pears commercially in my region since we don't have a commercial pear industry at all. However, we and North Florida might come to have one should California early crop pear growing regions continue to dry up on account of climate change. God bless.