I like that ypu're working with the skills and not trying to reinvent the wheel. From playing BLU more recently, i have to agree that really if there were combo chains on spells, or a gauge that worked with how BLU played, that it wouldnt really feel very limited. What end game BLU feels like at the current moment, is blasting oGCD about 4 of them for massive burst damage, then spamming 1 or 2 spells until eruption goes off cd. All they really need is either procs, or a sure way of landing a combo or anything really dealing with the filler, and it would feel solid enough.