Yes it is normal normal to take a few seconds more cranking when the float bowls have been emptied (but perhaps not as much as 30 seconds). Your revs hovering at 2 - 4k is usually an indicator of the air pilot mixture being lean (the increase in main jet size will only have had a very small effect on the low speed running). First I'd try turning the pilot air screws out to 3 1/2 turns out and see if that helps. You may well find you need larger pilot jets with your de-baffled CCC. If you do, you can get them from Allens R&D in Nottingham (01949836733) part number N224.103 follwed by the number of the size you want (17.5 is standard, so you want 20.0 or 22.5). Hope this is of help.
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