I have a vintage razor from my grandfather. When I shave I strop with a leather strop trying to keep the fundamentals in mind. Little or no pressure, blade stays flat with the edge and spine touching the leather and staying slow to work into these habits. I'll give the blade a quick pluck or two and feel the blade grab my thumb. Then when I shave I feel like my blade is dulling very quickly. I try to keep shaving fundamentals in mind. 30 degree angle little to no pressure etc. But quickly I find myself using more and more pressure and strokes because my blade feels dull, especially by my second pass. Should I do a second stropping before my second pass? I don't particularly feel comfortable sending it to a professional to hone as it's an heirloom and I don't trust the mail carriers not to damage the scales or anything. I have a stone and have researched honing and my blade seems extremely sharp afterwords. Is this a stropping problem? Suggestions? Help me please!

Thanks!
Bthr22