Should I switch from Maximize Conversions to tCPA if conversion volume is small?

What's your actual (or expected) target CPA? A sensible minimum daily budget is usually estimated as a multiple of CPA — a common rule of thumb: your daily budget should cover at least 2–4 conversions at target CPA, or you'll accumulate stats too slowly.

Do both flags actually apply to the same time window? Sometimes one status is current and the other is a holdover from an earlier period that hasn't refreshed in the interface yet.

Are these "different conversion types" actually different in substance, or just different paths to the same outcome — for example, a sign-up form, a demo booking, and a phone call that all lead to the same kind of qualified lead?

How many actual changes have been made to the campaign over the last month? Flip-flopping between statuses is almost always a sign of frequent edits (bids, budget, target, conversion actions, structure), not the algorithm "behaving erratically" on its own.

What does Auction Insights show for your core keywords? Overlap rate, outranking share, and impression share relative to competitors give you an indirect read on how aggressively they're bidding — but Google doesn't reveal a competitor's actual CPA.

Is the goal (target CPA and conversion type) really identical across the campaigns you're considering merging? If the targets formally match but the campaigns actually serve different products or audiences, merging could blend inconsistent segments into a single optimization.

Does your business have clear year-over-year seasonality? Compare the current period not just to last month but to the same period last year, to tell a seasonal effect apart from a structural problem.

Is this clustering actually a problem, or just a reflection of real demand? If one segment (geo/device/audience) genuinely accounts for the bulk of paying demand in your niche, concentrating there may be correct algorithm behavior, not a distortion.

Check the campaign's status in the interface — an explicit "Bid strategy constrained by target" or "Limited by search volume" flag, paired with spend running well under budget, is a direct sign the problem is the target, not a lack of demand in the niche.

How long has the campaign been beating target? If it's not a one-off blip but a consistent pattern over several weeks, that's a strong signal of untapped potential, not just statistical noise.

What's the real median (and "tail") gap between click and conversion for this business? Check the Time Lag report in Google Ads (the day-by-day "click to conversion" distribution) — without this number, any judgment about a recent period will be premature.

Which direction did the window change — wider or narrower? Widening the window (say, from 30 to 60 days) usually adds previously uncounted conversions retroactively, causing a sudden jump in the historical numbers. Narrowing does the opposite — it retroactively removes conversions that used to count.

Is there enough total traffic/conversion volume to split it into two halves (test and control) and still get a statistically meaningful read from each? An experiment needs roughly twice the data to reach the same confidence level as a direct change.

A quick primer: how tCPA compares to other bidding strategies