The following is more of a football answer rather than a ME solution.
Slightly different to knap's suggestion - I would suggest playing on control/standard but drop your defensive line to slightly deeper or deeper to encourage the opposition to come at you and open up vertical space.
Also you could shift the front 3 to a more realistic Inside Forward-Striker-Inside Forward - which will spread the front 3 out and cause more horizontal stretching of their defense.
If both of these don't work changing one of your central midfielders to a DLPs with hold position. This will set you up with a nice perimeter around their defense - causing you to sustain immense pressure on their defense and should eventually lead to a break through unless the opposition has immense mentals/stamina/positioning.
For anyone interested - I managed to get it working reasonable well using a hybrid of Knap's 3-4-3-0, Pandemo and my own front 3 flavouring
I have Iheanacho as a RMDa on the right hand side, Vardy at the central forward position (offset to the left to open more space for iheanacho) and I have brought in Perotti from Roma to play a playmaking inside forward support role to distribute to the two finishers. Gray is now coming off the bench and training as a AML advanced playmaker in an effort to see him develop as a future perotti - failure to do so will see him sold as at the moment his pace and dribbling does not have an end product (passing/vision/finishing/long shots all <11)
Working exceptionally well for the set of players at my disposal (better than the top plug and plays were) due to the perfect fit of players in different roles to the 3 AMC that most plug and plays use now.
Biggest lesson learnt from this is it is really really important to modify tactics to your own players strengths and to correctly distribute the playmaking and spacing of your players as overloading the AMC slot will not work if you do not have skillfull high balance high passing players to create a through ball chance - running 3 poachers in the AMC slot playing SSa does not work - your far better off with 3 APs in those SSa slots as they will find the pass to unlock the defense.
But I think the point of testing is to end up in a star rating.
5 stars are all equal depending on the players you have, league you are in and whether you can make appropriate adjustments.
even if its 30 points like you say. that would at most make a 5 star tactic a 4.5 star one which would still be an elite tactic so I think its generally a waste of the mods time to retest over n over. Especially when theirs new tactics being uploaded all the time