Faster tapping will usually require less torque.
Yes, it´s also a very fast way to snap taps.
Deeper holes, at least 1 mm, may allow for more chip packing at the bottom.
8-32 is about 4.2 mm D, 3.6 mm PD.
As was suggested, cleaning and adjusting the clutch on the tapping head is probably a good idea.
Since Your use seems to be woodworking, I would try progressively larger drills, upto 0.1 mm oversize, at least.
Try the taps by hand, and You can feel how hard they are to turn.
Likewise, taps with extra relief might work.
Custom taps etc. may be as little as 200$.
Like always, machining is numbers.
How many are You doing ? per day, per hour, what ?
Is the loss a 10$ tap or a 1000$ piece of hardwood ?
How many holes do You successfully tap ? per week.
I would guesstimate that for woodworking apps in ridiculously long holes your customers probably have little/no idea or expectation of real hole D, PD, ultimate final strength of the fastener, or anything like that.
Simply using faster rpm, larger holes, and perhaps extra relief on the tap would perhaps work.
Good taps on good material should do 3000+ holes, with rare breakage.
For 4 mm deep 3/4 inch == 18 mm, perhaps 1000 holes per tap.
Mild steel is often gummy with surprise inclusions and hard spots.
4 mm / 18 mm deep is very very hard to do in MS.
It´s about 4-5x D or diameter of hole, classified as a Very Deep Hole, and MS makes the app harder.
These days there are speciality taps made to be driven by impact wrenches.
They are probably extremely strong - impact wrenches have ridiculous loads.
Call 2, ask for a sample.
Videos online.