You don't have to double-clutch going up, and yes you can tap the clutch or lift & stab the loud pedal, it shifts fast...it took Me awhile to actually time the foot action soon
enough as I found I was behind My shift arm with it. As far as a disc, You've got to use what will hold 1st, and then worry about getting the most friendly version second.
I had a cerametallic button disc unit w/a diaphram in My Dippy w/a 383 & nitrous, it wasn't strong enough tho' it engaged fairly reasonable, it left scoring in My flywheel
that diminished that smoothness to an extent.
