alany

Dampen your 10 g batch with about 1.5 g of water, knead it a bit, force through a sieve and dry before testing (while you wait for your mill parts to arrive), should make it a bit easer to ignite. Also a glowing splint or a jet/blue flame butane torch is a much better ignition source for composition testing than a match or lighter. Lighter flames are fairly cool, easily blown out and just plain frustrating, a good piezo ignition torch is an investment you will not regret.

You may find compacted comps easier to ignite also, try rolling a 5 mm or so paper tube, about 20-50 mm long from a few turns of paper, then press or funnel and wire load comp into it until you have a filled it solidly. Stand it upright, say with a little blutack or by pressing it into a sand bucket, then cautiously light the powder surface at the tube end. By timing burns of identically loaded tubes you can make meaningful comparisons of your composition burn rates as your techniques improve. Burning piles is instructive to a point, but frequently misleading once sufficiently good incorporation is achieved (goes "poof", but you can no longer judge which poof is better).

Being able to make black match makes this a relatively safe and easy test, you can stand back and observe, video/time with stopwatch, etc. You should try to make good quality delay elements like black match or Chinese fuse ASAP, they do not require spectacular quality BP but milling will help. Of course if you can get commercial fuse, use that.

BTW: leaving piles of failed test comps around is a bad habit, at the very least wash them away with some water.