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1/ A disposable is not necessarily sharper.
2/ You don't have to throw away a SR after a few uses. :)

No probs. Stropping is a bit of a challenge at first.
My offer holds even tho i didn't hone it but maybe whoever did it will help you out too. Doesn't sound like a big job.

If you use a really flat approach sometimes even with spine contact & there is discomfort I think something is possibly wrong with the edge.

Stropping is often the culprit with those symptoms. If I honed it please send it back & will touch up F.O.C.

A straight should not tug & outcome should be the same as a DE ie a close shave so can't see how one is actually sharper than the other.
Would suggest some of the previously mentioned points may be...