Can I stimulate another round of new growth

[ArronOB]

Please forgive me if this is going to be a bit long-winded but I want to get all the detail down at once.

Also, please note I'm in the Southern Hemisphere so seasons reversed.

In autumn last year I bought about 35 young cattleya-alliance plants in 50mm (2inch) pots. Most are hybrids, mostly being largely from unifoliate parents, with a few predominantly bifoliate cluster types. There are also about a dozen which I bought as 'cold tolerant laelias' (anceps, purpurata, crispa etc and hybrids).

I kept all these plants inside over winter and by late winter they were showing signs of new growth so I repotted them in the next size mesh pots.

Then they went through about a month of neglect while we moved house, but by early summer I had them settled outside in a shadehouse.

I grow them in a mix of pine bark and charcoal, water 2 of three days and fertilize weakly, weekly with an 'orchid fertilizer'. Light in winter was a bit inadequate but I keep the shadehouse bright.

Anyway, they must like my regime because their general condition is excellent - there's hardly a leaf blemish or insect bite across the lot of them.

Now, just short of mid-summer, the new growths have grown strongly and now are about 4 to 8 inches long, which is about all I would expect for the age of the plants, and the bases are swelling into psuedobulbs.

So my questions are

1. is that it for the year? I understand that orchids have defined periods of growth and rest, but does that mean they intend to take the rest of summer off, or is there something I can do to stimulate them to produce another round of new growth ?

2. if there is, is it a smart thing to do? There should be about another three months of summer-type weather. Is that enough, or might it lead to sickly growths? Or will putting the plants through another growth cycle perhaps prejudice their growing season next spring ?

One thing we dont have to worry about is the new growth being hit by frost. We are new in the area so not exactly sure of what to expect in winter but I think winter minimums should be about 48farenheit outdoors and 57f indoors in the unheated parts of our house. I'll probably take indoors the ones I think are sensitive and leave the hardier looking ones in the shadehouse.

cheers and thanks for reading
Arron