Thanks! That's very informative! At first glance, would there not seem to be a yardage gap if I have a 1W, 4W, 4H, 5i etc? To my rookie knowledge, it feels as if there is quite a gap between the 1W and 4W (and especially since I might not be that consistent and comfortable to use the 1W (driver?) all the time. Would a 3W be a good addition in this case, so that I can at least practise and get at least some more distance in my tee off?

I'll need to check my clubs for their loft, don't really recall seeing them. And there doesn't seem to be much information on the net on the Maruman Proliner G1 set :P