We're talking about spoilers cracked open a small proportion of travel, on one wing, at up to and below 140 kts, rather than full spoiler operation on both sides at 150kts plus. A good rainfall on the fuselage and wings will probably provide more drag!
I have, I think, been fortunate all my flying career in being able to sense minute changes in acceleration and attitude
I was never blessed with razor sharp super-senses and other superpowers! I sure wish I was gifted with some of BOAC's superpowers! I'd settle for the X-ray vision- must have been well fun with the cabin crew! I have to do it the hard way. Plod along....but I enjoy it, even if i only do it by the numbers. Haven't broken anybody yet......except the baggage cart driver at Washington. That was her fault though.