total bike weight bike weight is overrated so a large degree. sure difference between 30 and 20 is noticable but 22 and 20??
any way I can fit a 30mm corsa control tubular in my 85 team miyata, run 28 easily with both it and my 84 team miyata.
another thing to look at is wheelset.... a lighter wheelset can make an amazing difference. I see this with the difference between a mavic gel 330 tubular set and a mavic ma40 clincher on the 84 miyata. so consider going tubular
good luck
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)