I don't think it's a matter of upgrading the bike really by going from
hybrid to road bike. It's just a different tool for a different job. If the
job is to ride on roads, and both distance and speed are important to you,
you get a road bike. Hybrids are wonderful for what they are, which is
basically an urban and mild off-road utility bike. They can do things a road
bike can't, but, they can't compete with a road bike on the road.
I've been cycling recreationally since the 1960's. I always had a road bike.
I experimented with hybrids during the 90's, but, I find there is nothing
like the efficiency and comfort - yes, comfort - of a conservatively set-up
road bike. By conservatively, I mean somewhere between the efficiency-only
riding position of a full-on racing bike and the more upright position of a
touring bike. Mine is setup with the seat height higher than the
heel-on-pedal method, but lower then the x .883 formula. My handlebars are
about 3/4 of an inch lower than the saddle top, and my stem is the
appropriate length for me and that bike. It's not a racing setup exactly,
but it's not upright either. I get good weight distribution between butt and
hands, and I'm not overstretching myself in any way.
Experiment for yourself, but if what you want is speed and distance, start
with the right tool for the job. You can't expect a hybrid to give you the
same speed as guys on racing bikes will make over longer distances. They are
just too heavy and clumsy for that.
BTW, you would find it hard to setup most current road bikes on the market
as mine is. Mine is a custom, but it's possible to do it by very careful
selection of the bike. An audax-type bike is the best bet for what you want
to do, but these aren't very common in North America (which is why mine is
custom-made).
How slow am I? Very slow, but then, I have no kidneys at this point. You do
what you can do. I don't measure myself against anybody else. Never have,
even when I was healthy. A better way, I think, is measuring yourself
against yourself.
Peter