Only the top two, CIYMS and Waringstown managed to complete their games on Saturday and with both recording wins the league table remains unchanged.
CIYMS could not quite match their 200 run win from the previous encounter with Muckamore but a 174 run margin more than reinforced their superiority in all departments.
Their 314 for 6 was led by an unbeaten 82 from Jason vd Merwe but there were runs all through the order with John Matchett (58), Nigel Jones (47) plus quick-fire twenties from Ryan Hunter, Jacob Mulder and Matt McGillivray.
Muckamoreís reply stuttered as Jones, Coulter, Matchett and Britton each claimed two wickets and only Craig Drummond with 34 managed to get out of the twenties for the home side, bowled out for 140 in the 43rd over.
At The Lawn the Instonians openers set about the Waringstown attack in some style. James Metcalfe outscoring the in-form Jordan McClurkin as the boundaries flowed.
On a pitch that offered spin and bounce it surely was only a matter of time before the home side exerted some control and the introduction of Gary Kidd and then Kyle McCallan did just that. Kidd finished with 3-40 and McCallan 1-20 in a crucial 10 overs.
Shane Getkate and Andrew White were taking what they could and had put together a 64 run 5th wicket partnership when with White on his heels Getkate committed to a run and was beaten by the throw to bowler McCallanís end.
White was left trying to manipulate the strike as the youngsters down the Instonianís order found the going tough.
Instonianís total of 208, bowled out in the 46th over owed much to their flying start and that Getkate-White partnership which once broken put the brakes on the scoring rate.
Adam Dennison and James Hall opened for the home side and after an hourís rain delay set about the reduced target of 173 in 35 overs in their usual style.
They put on 77 for the first wicket and the appearance of Kyle McCallan at three suggested that Waringstown had things well in hand.
But somehow Instonians chipped away, rang the bowling changes and always seemed to get a wicket when they needed one. James Magee in particular extracted bounce from the pitch and unsettled more than one of the home line up - his 3-29 the best of the Instoniansí figures.
In the end Waringstown crept over the line rather than stormed over it with the spectators wondering how they seemed to make such heavy weather of it
At Stormont Armaghís woes continued as they managed only 158 - Colin Russell top scoring with 40 before the rain set in and the match was called off before the CSNI replied started.
Biggest disappointment of the day must belong to Carrickfergus at The Green where a Jamie Holmes century (102) and 93 from Pat Botha set them on their way to a total of 340/7.
The North Down reply was just into the third over when rain forced a halt to proceedings and the Cowboys left pondering what might have been.
No change at the top of the table then except that CIYMS have put another notch or two onto their Nett Run Rate as they remain 4 points ahead of Waringstown and with a game in hand.
PREMIER LEAGUE RESULTS:
North Down v Carrickfergus - no result. The Green, 11 August.
Carrickfergus 340-7 (50.0 overs, J Holmes 102*, P Botha 93, M Gilmour 49, C Robinson 2-44)
North Down 16-0 (2.3 overs) Abandoned due to rain
CSNI v Armagh - no result. Stormont, 11 August.
Armagh 158 (48.4 overs, C Russell 40, S Lester 27, M Foster 3-25, A Malan 3-37, A Cowden 2-11)
CSNI - did not bat due to rain.
Waringstown beat Instonians by 4 wickets. The Lawn, 11 August.
Instonians 208 (45.2 overs, A White 58 , J Metcalfe 39, J McClurkin 38, G Kidd 3-40, S Khan 2-45)
Waringstown 173-6 (33.5 overs, J Hall 39, L Nelson 28*, A Dennison 27)
DLS Method: par score 172 in 35 overs.
Muckamore lost to CIYMS by 174 runs. Moylena, 11 August.
CIYMS 314-6 (50.0 overs, J van der Merwe 82*, J Matchett 58, N Jones 47, A Shetty 2-93)
Muckamore 140 (42.5 overs, C Drummond 34, A McDaid 25, N Jones 2-14 , J Matchett 2-18, T Britton 2-30)