May I ask what is the problem with 30mm tube? It usually would not affect mounting height because your objective glass will be larger than 30mm anyway. 30mm tube in the middle section of the scope would is only a few grams heavier than a 25.4mm tube. 30mm tubes usually offers more elevation adjustments so that they can be mounted on a wider range of rifles and wider range of zeros without running out of adjustments. running out of adjustments is a headache for both the consumer and retailers because usually when this happens the retailer is (at least morally) obligated to either refund or exchange. All that extra work increases costs which gets built into the price, and weakens the customer experience. This I think is probably the main driving factor behind everything moving to 30mm tube.
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