Have I hit my plateau?

I've been a regular MTB'r for the last 3 years and last spring bought a road bike. My regular route is an out and back 15 miles slight uphill one way and 15 backdown. After about 2-3 months on the road bike I was averaging this route at about 17-18 mph. Thing is I've not really increased this since and when I do push hard I find that I can hold 20mph for about a mile or 2 but then have to back off as my feet are burning and my hands have pins and needles.
Thing is I can understand that I may not be a great climber as I'm more rugby player than Contador but on the MTB I'm pretty quick on the flat and can cruise the same out and back at 15-16mph with knobblies.
Is it just the case that I won't go any faster or should I get my position looked at?
I'm using mtb spd's and shoes and I wonder if stiffer soles and Road pedals would help? Any ideas?
Cheers for any advice.
Thing is I can understand that I may not be a great climber as I'm more rugby player than Contador but on the MTB I'm pretty quick on the flat and can cruise the same out and back at 15-16mph with knobblies.
Is it just the case that I won't go any faster or should I get my position looked at?
I'm using mtb spd's and shoes and I wonder if stiffer soles and Road pedals would help? Any ideas?
Cheers for any advice.
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Best to get a bike fit done to rule that out to be sure. If you are setup on the bike properly then have a look at shoes / bars etc. Go for the cheapest option first, which will be an online fit systems, if that doesnt help your riding pop into a LBS for a fitting and go from there.
FWIW, I get pins and needles in my hands when I'm giving it everything in a time trial. Probably just the build up of lactic acid I think.
If you get on well enough with your LBS, you could simply ask them first about pins and needles and position rather than ask about a bike fitting.
I reckon it must be bike position and perception of being fast. I just assume that Id be happily trotting along at 20mph with minimum effort on the roadie where i can do 16-17 on the mtb.
My legs a bit further bent than my mtb position and I haven't messed around with saddle height, fore/aft much. I reckon maybe i just need to train more efficiently and change things about a bit with setup and see how I go.
Cheers again.