Factors that support defoliate auto's:
- The strain can handle it (look at other growdiaries with the same strain);
- They are very bushy and blocking light from bud sides;
- They are healthy and growing fast;
- They've showed good response to LST;
- Everything in your grow environment is in check, to (potential) variables that can stress them out (for example heat or high humidity);
- The plants have been resillient and strong since the start of the vegative stage.
In the end, it's always a judgement call. Defoliating helps light penetration which in turn helps bud development of the buds not directly at the top and therefore increases yield. However, the plants need their leaves for photosynthesis: the process that provides energy to them to produce frosty buds. Thus: removing leaves has positive and negative effects. Its a matter of finding the sweet spot, which is different for every strain, grow environment and even individual plants of the same strain.
You're not in the phase yet to defoliate. Start doing some LST. Do a little defoliation when the first half of flowering stretch is completed. If they respond well, it pleads for further defoliation as said in the first alinea.
Goodluck!