hes pretty bad what sizing u going vs these massive whales
39-49 He already put in 25% of his stack. 61 is half his chips. 39 would set up river shove nicely but may give him odds to draw out on you on the river.
I would go smaller on flop (1/4th to 1/3rd) and then build turn/river geometrically As played I'd just go half again on turn