Hi Chris, It should be OK at the moment. Giants reacts very quickly to heavy rain over the Rushop bowl, and I've seen Garlands where the whole pitch head has been obscured by knee-deep white water shooting out as far as the opposite wall - but, being a swallet, it goes down very quickly too when the rain eases off.
If it is really wet, Garlands is the most serious problem because it is easy to rig it for the conditions on your way down, only to find that it's turned into Niagara Falls when you try to get out!
Recent weather has, as you say, been quite dry so you'll probably be OK, but, if you have any doubts, you still have a few options without going as far as Garlands - Upper West, Upper East, the Wet Inlets and Boss Aven are all worth a visit.